I have started over as in I climbed the mountain of tech roles to CIO, then I was a founder for a few different companies, a couple that I successfully exited and then I started over as a senior engineer at a company and now am the CTO. I actually love being just an engineer but also love being CTO or a product person, mainly because I really enjoy the team building aspect and solving hard problems.
What I can say is be careful on your expectations & motivations, starting over and being a novice in a new field will feel different than starting over and having been already successful in a field/industry. Check the career growth, salary growth of the positions/field before you jump because something I discounted was the lack of monetary growth can significantly demotivate you. At least to me, and I think most people in tech, money isn't the only motivating factor, but the lack of progress monetarily sure can demotivate you quick.
Then started hunting for a new job. As I came to realize, having quit a job without first lining up a new one does kind of put you at zero.
Did eventually find a nice (albeit low-paying) job. No regrets, though. I did a great thing for myself. And I suppose I do feel a certain righteous schadenfreude every time I hear hirers complaining that they can't find anyone good anymore.
I have to learn all over again. I know the basics of a language as they use the same logic as others. So I can write small programs in Python, but I have to reinvent myself.
I am 51 years old, and it seems I am too old to hire. Especially when I have a disability. So I get overqualified for most job postings and no response for others.
In the past, I've known people that have switched to sales in tech. They are more account managers than sales. I've thought about it but I can't handle the travel.