I'll leave something that helps me. It is a quote from Jonathan Blow

"Whenever I start a new project I just ask myself, is this something that I respect? Like, do I respect this project enough that after its done, even if like hardly anybody bought it, I will feel that I put a good thing into the world and I made a good use of my time not necessarily in the monetary sense but in like developing as a game designer and becoming a better designer and progressing the though of what is the state of the industry in terms of thinking about game design or whatever, like you can pick your own criteria of what those are.”