I can recommend the book "The Entrepreneur’s Guide to Keeping Your Sh*t Together". It's for solo entrepreneurs and doesn't want to sell you success or make you

I can recommend the book "The Entrepreneur’s Guide to Keeping Your Sh*t Together". It's for solo entrepreneurs and doesn't want to sell you success or make you strive for even more, it assumes you already have success but need mental models to deal with it. Also what others already said: start hiring. You don't need a cofounder, try a consultant for a fixed contract with fixed payment (no revenue share or such).