Hair help

Jasper • 🥰I’m a little🥰 ✝️Christian: God and Jesus always come first✝️ 🖤I’m emo🖤

So I had a liver transplant when I was a baby. The medicine I take makes my hair very thin. Recently, I got extensions and left them in for 4 months. Yesterday I took them out. My hair is now thinner than it was before. I’m only 13 and I get made fun of because of my problem. I don’t want to have to be worried about hair loss. I need advice on how to get it stronger and thicker