Silent.....It seems you may be a little confused or have used the wrong word. Self-esteem=confidence=self esteem.
I'm just guessing but could it be that you meant to ask, "How to raise self-esteem without becoming egotistical?"
There's quite a difference. Egotistical individuals do not need more self-esteem...nor more SELF-anything, actually. They're pretty much "full of them selves" to the max. Most EGO-maniacs usually could benefit by being knocked down a few pegs.....or at least off their self-constructed throne.
It seems to me this was the question you were intending.