You should look into a "downshift" job. I know plenty of people who have done this. One started as a chip designer, worked up to engineering manager to facility director. He had enough of the politics and BS being a director and moved from that job back to that of a chip designer. I never saw him so happy after he did this.
You can do whatever you want or try different things. That was my initial plan when I retired a year ago. My thought was to do stuff I wanted to try. Maybe pizza delivery. Maybe work at Starbucks. Maybe in to Home Depot or the hardware store or in an Amazon warehouse. I retired a year ago and lost all intent of ever working, doing anything, but I'm double your age, so have 40 years of working behind me. You can also do part time somewhere. I would not recommend contracting as everyone I know who's done that works 60+ hours or more and many have gone back into the regular workforce, tired of non-paying customers.
As others have said, burnout is no joke. I spent over 20 years in public education before I ducked out. It's one of those careers that is not only a job, but also an identity and not easy to replace.
I actually started working part time at a local orchard (kinda quaint, but mostly hard labor) on my transition out and have stayed on for a few years now. It's much less of a time commitment, much lower stress, plenty of time outdoors, and a great social outlet. That and therapy (highly recommended) were the keys to a good transition. I make substantially less (like less than 1/5) what I made before, but it's enough to cover my personal expenses while my wife continues to work somewhere earning a real wage and still finding some meaning in it.
I'd definitely suggest a part-time gig. In much of the less-formal economy (farming, family business, small retail, light construction/renovation) employers don't really care why you're taking the job as long as you're reliable and a decent worker. And many of them will be very happy to have you.
Of course, this might lead to other "opportunities" in the future as well. If I was in my 30s and a similar financial position, I think I would have probably been working on a degree in orchard science by now, but it seems less likely with every passing season. That's okay with me too.
Working (or volunteering) in an unrelated field for a small fraction of your previous salary would probably seem like a huge step back to much of the (American consumer) world, but that doesn't matter. If it makes you or others feel better, you can always just play the eccentric card and with all honesty just say "I just wanted to try something different for a while". At this point getting out of your head and into the world is much more important thing.
So therapy to help deal with your own internal uncertainty and some occupation outside of the house with other people to engage with the world and develop a new external orientation. And remember it takes time, way more than you would think.
