https://lifehacker.com/how-to-help-your-kids-build-self-esteem-1841909386
Don't Over-Praise
While it's natural to want to praise your children, over-praising them can be counterproductive. Constant praise can lower the bar for them, suggesting they no longer need to push themselves. True self-esteem comes not from praise, but from developing competence.
Focus on Competence
Self-esteem is built on three pillars: feeling loved, feeling secure, and developing competence. While parents often provide the first two, competence is something a child must build for themselves through effort and practice. Confidence comes from doing, trying, failing, and trying again.