I'm reminded by keynote speaker Leslie Chan: share your contracts, share your salary or hourly pay rate. If illegal to share contracts (NDA), do it clandestinely. (My suggestion not his.) Compare/contrast. You'll be shocked who gets paid 2x for doing the same work, especially where gender/race is concerned.
I shared this doc of every salary I ever earned a few years ago. https://docs.google.com/spreadsheets/d/1JPHbAtAc2MU53or9nm_dUTOyyGwsjQqLu_9ITYt3yWg/edit?usp=drivesdk
And yes: I have been paid literally too much money for several jobs