How to fix ice buildup at bottom of your freezer?

How to fix ice buildup at bottom of your self defrosting freezer

Frozen drainage of self defrosting freezer
Frozen drainage of self defrosting freezer

Few weeks ago I noticed ice buildup at bottom of my self-defrosting freezer, my freezer. It was nothing dramatic at first, but there were more and more ice over time, and I ended up having to clean it every few days