lol, interesting thread and question. This is me speaking outta my @$$ and not from experience, so take that with all the salt you can stomach.
Assuming you are talking about doing something that doesn't require going back to college for, then we are looking at stuff you can do by building on where you are now. You mentioned the owning your own business, consulting, etc. Up to you to decide whether you want to do that or not. Sounds like you don't want the hassle of managing other people, HR headaches, maybe the paperwork hassle, etc.? Consulting as a one man show would be much better in that regard than running, say, and AV installation company that does a mix of work, including high volume low profit stuff that keeps the lights on. Doubtful you'd ever get so good at something working for
someone that they would pay you highly for it. May be fulfilling though.
So consider the consulting thing. Consulting in what, as a one man show? Well, this is the outta the @$$ part, but I'd look at stuff that wealthy people want now or are likely to want in the future that will require specialized knowledge in the field to provide, and get good at that. Really, really good. Maybe related to home automation, maybe the next big thing, whatever that may be. Become indispensable either to the client directly or to other companies, installers, contractors, whoever that don't have someone that can do what you do.
I think that advice is worth about... oh, maybe a pinch of salt. But it looks pretty on the screen.