You repeatedly say "I am stuck". What does that mean to you?
What does "being proud of" something you've worked on, look like to you? I've been in this business for 26+ years and NOTHING I've done in my career, would qualify for being "proud of". What I AM proud of, is the person I've become, the relationships I've fostered, the children I've raised.
I get that this career choice can seem overwhelming at times. I've tried to specialize more than a few times, but it didn't work out. Primarily because I was chasing the money. In other words, doing what paid me and paid me well because I have a family to support.
Honestly what you've posted above, sounds so much larger than your career.