Firs time post here, I've been lurking for a long time, but, this thread here gave me a bit of a push to join, as I face the same issue. First, a bit of intro, and about 2017 Halloween, and what I do to attract more trick-or-treaters.
I'm not on a culdesac, but, it is down a street that terminates, however, there are plenty of houses around. Not lots of auto traffic, since the neighborhood was designed so traffic that enters, is pretty much doing so for the neighborhood, and not to shortcut someplace. Part of the issue for me, is it seems less, and less people trick-or-treat anymore, but, who knows, maybe like rollerskating rinks, trick-or-treating will make a comeback!
I notice some neighbors nearby, they don't even bother trick-or-treating in the neighborhood, they just take their kids to the mall, trunk-or-treat, or one of those things. I think part of it is the, "Safety" thing, also some parents and kids can't be bothered to walk much. Not much fun in that, I think. I have awesome memories of trick-or-treating, I doubt I'd have the same if I had gone to something like that.
Anyway, I had a comment in 2017, I had not had before, some 12+ kids said to me, Halloween night, "You have the BEST HOUSE" (around here)". I had not yet heard that one before, so, I took the compliment, and said thanks.
Also, later that night, I had a few kids attempt to trick-or-treat a 2nd time. i caught them though, also kids about 12, 13, 14. I gave them a bit of a hard time about it, to let them know I caught them, but still gave them a few small pieces. I like the challenge, to see if I recognized them...
Also, the next day, I had someone knock on my door, it was a group of mostly older kids from the night before, including 1 or 2 that either did not go trick-or-treating, or missed my home. They asked if I had anything left over.

I had plans for the leftover candy, so I gave them each some bouncy balls and fake bugs. Maybe a few small pieces of candy, I forget.
Less people decorate nowadays, compared to when I was younger. Halloween, when I was younger, was an event. I loved the experience, seeing the house, etc. My mother would get into it, also. Nothing super fancy with the yard, but we decorated, and sometimes with some wacky stuff.
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Where I am now, for many years, it has been a bit on the decline, like kids can't be bothered, but, I notice more kids in the neighborhood now, than in prior years. Kids grow out of it, or eventually move on someplace new, etc.
I used to do some basic stuff, with Jack-o-lanterns, a spooky "Welcome" sign in the yard, something hanging on the door, etc, then, I many years ago, I had to think back to what I enjoyed when I was younger... What really stood out to me
One of the first things I, 'Brought back" was the spooky sounds Record/cassette/CD. People may recall these from Hallmark, etc. I have a CD, so it is easier for it to be on repeat, loop. I stash a boombox someplace with it. That gives some kids an audible thing to track down. A few of the younger kids are a bit apprehensive about it, but, they are normally with parents, so it's fine.
Decorations, the jack-o-lantern, sounds. Something visual, something audbile.
What I've, is gradually add things. The person posting above, showed some of the things he puts in his window. I do something similar, for Halloween night, I light up some windows with colored lighting.
I gradually add decorations, but keep to a theme. Try not to clutter it up, and make it too much of a mish-mash. I like skeletons.
Halloween night I leave my storm door closed, and my main door open, so people can see someone is there. Though, i recently stopped having normal lighting there, inside the front door, and I now light it with colored lights. So, from afar, people can see at ground level, an odd light coming through the door. The porch light, i swap that out for a dimmer bulb on Halloween night. Always a good idea, regardless of decorations, to have a porch light on.
So, each year, I try to add a little something extra to the outside. Something a few others in this thread have already mentioned. I also think back to things I enjoyed.
Last year, was the first year I decided to do goodie bags. I've often handed out not just candy, but some other trinket. Usually bouncy balls. Candy will be consumed, then gone. The bouncy balls, hang around, though. I recall one year a kid exclaimed, "WOW! A bouncy ball!"
The goodie bags, and some other additions last year, seem to have got a bit more word around. It was the first time I had kids looking for goodies the next day. I am expecting a bit more this year, 2018.
Also, my number for 2017, was about 65. Not a lot, I've had worse years, I've had better. Though, most of the better years are from at least 10 years ago.
Another suggestion, is to be fair to the older kids, kids not in costume, or in a lazy costume. Especially if you don't get many trick-or-treaters to begin with. Older kids, i leave alone if they are in costume, since I trick-or-treated for a while, and also, why not. If the kid has no costume, I do give them a bit of a hard time. I mention to them they could at least go get an eye patch or something. I had one older kid a few years ago approach the door with his mask tilted up, and talking on his phone. I ask him what do you say, I wait for "trick-or-treat". I also asked him about his mask being propped up, talking on the phone, and asked him to put his mask on proper so i could see what he was, before giving the candy. So, i have some fun with it.
I started doing treat bags, since I remember that being a big deal when i was younger. I would sometimes open the bag while walking away, to see what was inside. The surprise element. Also, it keeps kids from being picky about candy in the bucket. With the goodie bags, it's random. I put an assortment of candy in there, some chocolate, gummy, etc. I also toss in some trinket(s), like the bouncy balls.
I also keep some loose candy, in case I get more kids then expected, I have enough to hand out. I also keep enough loose candy around for the kids who show-up a 2nd time. No goodie bag for them, but, here's a small treat for trying to fool me.
Also, i suggest decorating early enough, and not the last few days leading up to Halloween. Getting the decorations out there, lets people know there will be something there Halloween night. I start at the beginning of October, and if I see something cool, I may add to it. I also let some pumpkins sit out front for a while, then, Halloween, I carve them into jack-o-lanterns. A tradition with me, I just always did it that way, even as a child, before going out to trick-or-treat.
I also put a few things in the backyard, so neighbors behind me, who may not otherwise drive by the front of my house, have something to look at
So, that is what is working for me. Thinking back to things I thought were cool, and just adding a bit every year. Also, people don't really decorate much anymore. A few people where I am do something, but, it's not all that many. So, I try to do something a bit more memorable for people who bother trick-or-treating. If I had more trick-or-treaters, I'd probably slim down the treats per kid, but for now, it's OK.
This year I am adding a fog machine. I have been gathering information, also from this site, about the fog chillers, and methods to diffuse it. It's not a huge cost, seems like it could be fun, so, I'll go for it. I was going to add it last year, but, i added some other stuff in 2017, and I wanted to save something for 2018.
So, I try to do things to keep the house a bit fresh, and also stand-out a bit more. Bring attention to it. Also, have some memorable treats. The goodie bags have added an element of surprise, it has also saved me time, with picky kids who want only Reese's Cups, Snickers, Sour Patch Kids, whatever.
I would like a bit more kids, 100 would be cool. Its been that way before. Having a reasonable amount would allow me to continue being so generous with the treats. If I had 500 trick-or-treaters, like some have mentioned here, I'd have to slim down on the treats. I think this thread, or another, a poster mentioned to, "Be careful what you wish for", if you are trying to get lots of trick-or-treaters.
Well, that's a good first post. I'll post here a bit more often, been lurking for a while. A lot of good information here!