"Startup, parenting, hobbies, friends. I think you can do 2 of these well. But you'll have to quite light on the others."
Someone on X, don't recall who, but it resonated.
For “parenting” and “startup”, I would say that each is extremely hard to do well even when it’s the only thing on the list.
It shouldn't be hard though. For me personally, I'm mostly friends with other dads with kids and I do my hobbies (music, rock climbing, skiing) with my kids. It's not that difficult.
Why not having a hobby that includes friends? Playing in a band, singing in a choir, hiking, learning a language in evening school, going to the pub, just to name some of the possibilities. There are a lot more.