Couple things... first and foremost welcome back you were missed. I'm also wondering what happened to Jim Warfield does anyone know if he's okay?
Anyway let me say this first and foremost and I hope you don't mind me talking about me for a moment... I got into this business when I was 19 years old. I use to do everything, I built every scene, painted ever scene, I acted, I managed, I did the marketing, I made the flyers, there was very little I didn't do myself. I acted in my haunted houses well into the days of Darkness and Creepyworld I'd say mid-30's I stopped.
I'm now 44 years old... where did the time go? Who has my original how to video look back on that and see how young I was holy cow! Time just flies!
I feel a bit old myself, I don't really have the energy to act anymore, climb up walls, carry wood around, or any of those things... I'm more of a delegate type of guy now, I work on marketing still, but I no longer make my own flyers (LOL). I feel worn down from the grind of it all myself. In the old days the minute the haunt closed I was in there myself working the following day on new stuff... that hasn't changed other than the fact I don't do the work myself anymore.
I find just as much joy in the fact that I still create things, and guide others to great things, and teach people what I know without having to feel the need to show everyone I can still paint something or build something, or whatever. I have a great crew who are much better than I am at many things, so we work as a team to accomplish everything. But I'm sure they would tell you without me we couldn't get it done, and I would say without them we couldn't get it done, and without my partner we couldn't get it done and blah, blah... its team work. Everyone who works with me we all know what we do and we stick to those roles for the most part to do our part in making things great.
So your not in the same condition as 10 years ago... that is expected. But that doesn't mean you can't shake your booty and let everyone know your stamp was placed on that that... you just adapt and change what you do and I think like myself you'll feel like you are doing more than before!
And for the record you mentioned wheelchairs... we had an actor in our que line rolling around in a wheel chair he was the scariest guy in the place! And for the record our scariest actor of all time is a guy who's only 3 feet tall, has all kinds of medical problems has to be carried to his scene, and he still gets it done!
I'd say find the inspiration to do what you think you want to do, find great people to work with you and as a team you'll fine more joy than ever before.
PS: Glad to see you are still alive in kicking.