Best decision I ever made was selling the company. I don’t miss it at all.
Sometimes I do a consultancy job (online marketing) on the side, just because I enjoy doing that. Not doing it for the money makes me better at it, because this way I can be “blunt” and it makes me immune to office politics.
I still work 40 hours a week effectively, but I can decide what to work on every day and take time off when I want to. My wife also has a fulltime job so I take the kids to school and pick them up every day. I love doing that.