I have always been self taught in my entire artistic journey. I'm mainly hobbyist so my improvement rate isn't as good as those professional or formally taught one.
Unlike most others, I never have phase of directly copying or referencing, may it be the entire drawing or style. I just absorb what I see, and practice it in my own craft with my own way. The topic of my childhood drawing is often my original creation (nothing good, just weird long-eared bunny fairy)
I got rather serious in drawing when I know deviantArt, my close circle of friends there are my influence and my inspiration to work on more art. Long story short, my art is improving because of I draw more often and exposed to resource of learning because if the artistic inclination of social media I am joining.
It's still lackluster to be honest but yeah you get it the formula to grow: draw often, have the right environment, and stay inspired.