To be fair, there's still an element of what you can/can't control as a people manager. Depending on the job, you can control the training your people get, the cadence of check ins, the deadlines/milestones they're supposed to meet, etc.

You can't directly control the people, and if someone doesn't take any of what you provide re: support for them to do the thing despite your efforts, you can't control that. But in turn, you can control performance improvement plans, 1-on-1s to figure out if there's an underlying problem/cause that can be addressed, or failing all else, elements of the process that eventually show said person the door.

Doesn't mean that all of this isn't stressful as fuck, or that you're not subject to downwards pressure too.

This is all an aside - I'm legit happy you're doing better working for yourself!