I also have the same 'welcome to the real world' feeling. I would say I've been bumbling along for 15 years, but recently I've discovered the joys of hiring others. I watched a YT video that was like give yourself time back by buying help before you think you're ready.

Now I try to spend most of my time doing things more unique to me that I can't hire another person to do. It's still a moving target though, I'm going to check out that book another comment recommended.