Don't judge your ideas through a lens filled with beat-tired late nights, sacrificed paychecks, and all the other trademarks of building something from scratch. Instead, view them as investments, so you can better gauge when to move on from a loser.
Tell me if this has ever happened to you: A well-known person in your field loses their job with impressive company X. Deep, deep inside you feel a vague sense of guilty satisfaction. They weren’t that talented anyway, you tell yourself. This will clear room for more up-and-coming talent, you say.