Self-esteem is the shadow of the idea of 'I', or the ego.
It doesn't exist, upon the annihilation of the idea of 'I' from the selfless mind.
It cannot exist under the presence of wisdom, void of ignorance and egoism.
Since it is not something real that can exist independently and permanently, and it is so fragile, while giving so much unnecessary mental and emotional disturbance to oneself and maybe some others that oneself comes in contact with, then why does one still wants to keep it?
None need the presence of self-esteem to be living happily and healthily, and keep improving in life.
None need to be developing, maintaining, empowering and constantly protecting that super fragile easily be offended, hurt and broken self-esteem.
Let it go, and be free.
"How to let go the self-esteem?"
"Give me your self-esteem, I'll throw it away for you."
"Where can I find it and how can I give it you?"
"That's right. You can't find it anywhere, because you can't see it, touch it, grab it, or throw it away, because it doesn't really exist. But then how come you believe so strongly in that, and rely on that, to live life, to be what you are and what you want to do?"
Similarly, there are so many things that doesn't really exist, but the mind is still strongly believe in that, rely on that, and be determined by that, giving so much unnecessary trouble or suffering to oneself and everyone else that oneself comes in contact with, physically, mentally and emotionally.
Inquire the truth of everything.