You are spot on. I see all this in me, too. Very interesting to encounter your take.

I try to turn what-ifs into actions. Instead of a what if rumination it is a small task, or a small trial of something, or a move in general forward rather than not. Not even remotely close to doing this well all the time, but I notice an overall boost in mood and productivity when I reorient my mint to progress rather searching in the uncertainty space.