How do you prevent employee burnouts? Manage wellbeing without privacy intrusion

Generally looking for best practices that you recommend in taking care of your employees.

I'm asking because the regular "ask them and they'll tell" usually falls flat until things are bad..and then it's more of a healing process of something that could have been prevented.

Also, speaking from personal experience, we sometimes don't realise how bad things are before they start burning us ..

What I've seen so far are general "mental day off" or random benefits that work as external rewards but not so effective long term (better than nothing Ofc)

Yeah, how do you do it?