Im going to speak from the creative aspect of your marketing. It sounds like you have worked every avenue out there to deliver your advertisement, but lets take a step back and look at what you are throwing out there to people.
I have not seen any of your advertising so I cant speak on if it looks professional or not. I do know first hand that marketing is HUGE and to me it starts off with your image.
What works in advertising is creating a clever marketing campaign. Sometimes its not just about creating some scary character and the name of the haunt. Its doing something clever with it. Get people talking about it. This can be delivered through the imagery or message without physically adding something inside the haunt. We all know your goal is to get people out there and sell tickets.
If people expect the same show every year from looking at your marketing, then maybe the marketing itself might be a little stale. Bad advertising will do nothing but keep people away from your attraction. Its just a fact. Poor imagery on your website, even a bad logo will do nothing but harm your business. You are better off showing nothing at all than bad images that tells people what to expect from your haunt.
Maybe its time to start putting out nicely, well done, professional video for online marketing IF You havent done so already. Great 'CATCHY' graphics so people will think 'WOW' this is different! And overall, a clever marketing campaign. Dont just tell people, "Hey we are *blank* haunted house buy a ticket". Come up with a very clever campaign and work around it. You want to tease people with your haunt so they will want to come out and experience it.
You dont just want to keep up with the trends, try to stay a few steps ahead of it.
Hope this helps!
Brutal Industries LLC