As a generalist myself, focusing and increasing your proficiency, in less areas really helps. It's excellent to be well rounded and be able to grab ideas that connect from a bunch of different places due to being so versatile, but sometimes it takes a mental toll.

As another poster said, product management seems like a good fit. Don't need to be an expert of one thing, as you should be managing the experts.

If you ever do start a new startup, I would be interested in working with you.