>>2036912I recently had this problem too, I took the freehub apart it turned out the internal spline which engages the pawls when pedaling forward had come seperated from the freehub body (in the picrel example, imagine the outside circle spinning when it should be solid). I have no idea how to fix it, even if I could get the spline out, I don't think I can do anything with it, except maybe jb weld it in place but a lot of force goes through those parts and it'd be temporary at best.
In my case, I'm just buying a new wheel (fuck buying a hub and trying to build it myself). Maybe your problem is as simple as needing to clean the freehub, but it already looks pretty clean and the cassette teeth don't look too worn, but I'd try that first. You might be looking at a complex repair or a new wheel, either way I'd take it to your local bike shop. Good luck dude.