Rewriting a crypto-related platform for the third or fourth time

A team-based monthly retainer but the client's investors are saying they want it done faster. Maybe I should have given options?

I floated what I felt was a very reasonable flat monthly fee for a team of 4 engineers (full stack + mobile), and included some scope description indicating that we think we can get the work done in a couple of months. Still a time and materials basis contract, but the client was adamant that he needed a feature list in with target dates in order to get…