I had my mid-life crisis a while back... actually now that I think about it it was around half my lifetime ago, and now I -- urk! *dies*

My reinvention came more or less after a breakup and the realization that my gf was quite toxic towards my naive ass.

Before the breakup, I was already looking for books about seduction and female pleasure. Said search led me to learning hypnosis. . Some time later, I also decided to try classic ballet, because why the fuck not. I actually had fun, despite never being even close to minimally acceptably flexible. Although I never got on with any of the girls there (most were too young anyway), the teacher was a blast.

So, my takeaway is to look for a group activity to do, be it some martial art, dance or something else.