How to ground my ego?

I trade futures which I’m on the cusp of going full time with, but I have one big problem- my ego.

I’ve noticed from my trading log that after a large win I will do something stupid and with inflated ego, take a big loss.

What Ego-grounding exercises, books, resources can I look into to help this problem? Thanks to any who reply.

(Already ordered ego is the enemy by Ryan holiday)