Your comments about writing being a solitary vocation resonated with me, and I would posit that a good way to get past the isolation of writing is to make one's writing be tied to a very explicitly-stated purpose, instead of "writing for writing's sake". For myself, the only reason I write at all is to try and connect with people who share the same concerns as me. But it can be quite discouraging to work on a piece and make it the best you can make it, only to have it sharply criticized. I've felt the same burnout you describe, and it's not fun. So: you aren't the only writer who feels this way.
Your comments about writing being a solitary vocation resonated with me, and I would posit that a good way to get past the isolation of writing is to make one's writing be tied to a very explicitly-stated purpose, instead of "writing for writing's sake". For myself, the only reason I write at all is to try and connect with people who share the same concerns as me. But it can be quite discouraging to work on a piece and make it the best you can make it, only to have it sharply criticized. I've felt the same burnout you describe, and it's not fun. So: you aren't the only writer who feels this way.