JOAT success requires finding good fit, in my experience. You want to go somewhere where they value you as you, vs as a shittier version of whatever thing they thought they hired. Fit is important for all jobs, but esp so in this case.

I like the term Jack of all trades master of some. Another term for this is skill stacking.

Here's an example. Lets say you are a pretty good programmer. Maybe not the best but that is a specialty. But also you are a good communicator and are very good at organization. Well now you are probably worth two great programmers at least on some teams. Many years ago one of my managers encouraged me to do public speaking. I had done a bit before but never seriously. She had me do presentations in front of educators. Then I started running a local developer meetup and doing talks to other devs on a monthly basis. Eventually I spoke at some tech conferences as well. This led to me being a key leader on teams, speaking to clients, going on sales trips to land new clients. I ended up learning other skills beyond just public speaking. I believe specialization is good. I've done it for a long time but I also think there is no reason why you shouldn't also try to find at least two complementary skills that you can get proficient at. Writing is a great one for almost anyone.

i'm an impostor type of JOAT

Being JOAT definitely gives you an edge, but there are people who hardly value this trait. People with JOAT capabilities are Ike rare breeds who are always in search of what suits them best. But when they find out, they are unstoppable. Ok, I am also and JOAT and I am proud to be one. People disapprove me for not being so successful because I didn't give it all to one particular path that might make me successful but I'm happy as I enjoy my life more than those boring specialists who always do, talk, eat, sleep and of course shit their specialization everwhere.