So you think it's you (bad validation of co-founders / partners or so?) or you think you had bad luck? Who did the raising? How big (FTE's / MRR)? I think it's very interesting information if you care to elaborate. I founded over 20 companies over the past 30+ years; I consider 50% a fail and 50% a success. A bunch still run and make me money even though i'm no longer involved, but I really am not interested in many employees or billions or extreme stress.
Common denominator: founder hubris and founder's syndrome.
Dealing with it currently. It's painful to watch people who think they know everything run a company into the ground, decimating investor money.