There's a thing called The Peter Principle - where you rise in the organisation until you reach your level of incompetence. I have to congratulate you on avoiding this horrible fate. Horrible both for yourself and others. I'm not being ironic here - if more people had a realistic idea of their own competencies then the world would DEFINITELY be a better place.
So props to you for being honest with yourself about what you can AND are willing to do. It's not strictly speaking imposter syndrome I think, unless you really want to play a competitive game of I'm better than you are, nyer nyer nyer. There is much to like about a regular and adequate for purpose pay packet.
Check out Dilbert syndrome online too, where incompetents are promoted to a level where they cannot impede production ....