I (16F) fell in love with my school choreographer (20F) and now she is ignoring me. What should I do?

Hello everyone! There is a situation in my life that I just can't stop thinking about.
I am currently a girl in the 10th grade (15 years old), but this whole story started back when I was in the 9th grade (14 years old). I'll be turning 16 soon.
One day, while walking around the school, I saw a girl and thought she was a new student. However, it turned out she was an adult—18 years old at the time. I liked her from the very first moment I saw her, but I didn't pay much attention to it at first. Soon, though, I realized that I didn't just like her as a teacher (she is a choreographer). I realized I had fallen in love.
After that, I started dating a guy and ended up in an abusive relationship, but I still had feelings for that girl. Eventually, we started talking from time to time; she even followed me on Instagram, and everything was going well up until October 2025. Before that, I used to take her dance classes, and at the end of the summer, I confessed my feelings to her. Even though my feelings weren't mutual, we actually became closer.
But in October, everything went downhill. She suddenly started ignoring me completely, avoiding eye contact, and not replying to me at all. It is my fault because, due to my actions, other people found out that I liked her, etc. I really want to fix our relationship and try to get close to her again, but she just won't let me... What should I do?