It's time for us to put down the idea that we have to think well of ourselves at all times to be mature, successful, functional, mentally healthy individuals.
Indeed, this toxic idea can foster a kind of narcissistic ego-based self-story that is bound to blow up on us. Instead of increasing self-esteem content what we need to do is increase self-compassion as the context of all we do.
That deflates ego-based self-stories, as we humbly accept our place as one amongst our fellow human beings, mindfully acknowledging that we all have self-doubt, we all suffer, we all fail from time to time, but none of that means we can't live a life of meaning, purpose, and compassion for ourselves and others.
Teach that to our young people, and we will have provided them a real skill they can use in the real world all their lives.