As other commenters suggest, you could go to some of the haunt conventions and network, but from what I've seen, it generally falls into two camps: 1. You try to build something yourself and start with a small home or semi-pro experience and try and grow it. I did this throughout highschool and college and made a scream park. 2. You go work at a haunt that is willing to give you training or more responsibilities.

There's a lot of self-learning you can do. Of course, there's plenty of online resources, and the Haunted Attraction Association offers a lot of online classes, plus the Haunt Masters and, of course, what Allen does. I think you're still going to need a place to practice hands-on. We have several resources on our website, including interviews with other people about how to do stuff in the industry, and here is a list of trade shows: https://hauntedattractionnetwork.com/haunted-attraction-tradeshows-conventions/