Earlier quoted context omitted.
I'm an intermediate dev, masters degree, 9 years experience, non-FAANG, higher cost of living area (not SV, NYC or NVA), and work with obscure tech and proprietary tools. It sucks that I suck. Oh well.
You might suck, but it seems more likely that you're getting ripped off by an employer who hopes you don't know what your skills are worth. Are you on LinkedIn? Do you ever speak with recruiters about other opportunities? That's a great way to get a feel for the 'market rate' for your skillset in your area. When's the last time you changed jobs?
I recently made the transition but it was extremely difficult. I ended up with 1 offer after ~10 or so interviews and ~50 or so applications.