Enough for what specifically though?
To be.
It can just be neutral. If we are being nice, we could add:
To take care of myself.
To not put myself in harm's way for the hope of approval from others.
If less nice, it can be 'you're enough, not the best, not excellent, not good or great, but enough to exist'
Are there some people who aren’t enough though? Genuine question.
Is anyone in a position to judge someone else as not being enough to be? I can get feeling that way towards someone, but actually making that decision is a different matter.
Maybe it's a sign of our society that something as simple as you are enough somehow gets turned into something about productivity and work. Yeah, like many things in psych, it can become corny and unhelpful when watered down and turned into something more commercial for consumption, I can get why that's annoying like many other affirmations, but we can just be sometimes.
It's not my mantra of choice for reregulating, but it doesn't have to have an expectation of getting something from someone else attached to it or even being that nice. They don't need to be to work for some.