Are you only applying to senior roles? Idk the specifics of your background, but it sounds like you haven't been somewhere long enough to get promoted and have largely worked on your own projects.
To me that doesn't really say that you have senior engineer skills, i.e. designing scalable systems (both in compute and development-wise), leading multi-person projects, considering trade-offs, etc.
To me that doesn't really say that you have senior engineer skills, i.e. designing scalable systems (both in compute and development-wise), leading multi-person projects, considering trade-offs, etc.