I think it's an interesting thing to ponder, and I have pondered it alot. Striking the right balance is quite the minefield and there's a slightly paradoxical element to it.
For example:
"Ooh, you're really good at x,y,z. You should promote that, do more with it, let your talent shine brightly.. "
"Oh Gosh, do you think so? I really don't think so, but thank you"
"Fair enough, your loss, you must have very low self-esteem, perhaps you should work on that"
Sometime later:
"Have you seen Mistress doing x,y,z all over the place and bigging herself up? Honestly, she's going to come a cropper, someone will take her down a peg or two if she's not careful"
To Mistress herself:
"Glad to see you giving x,y,z a try, didn't think you were going to take it that far, are you sure it's a good idea? Might want to scale it back / reframe it"
Mistress: 😳 "I have no idea how to play this game". (Backtracks and shoves what little confidence she had built firmly back under humility bushel).
Don't know if people will get what I'm getting at, but this mirrors some of my experience.