How do I let a friend go..

Just want to start by saying I 100% already know this is my fault. I was young and stupid and very depressed, but that’s no excuse. I cut my best friend off about seven years ago bc I wanted to self isolate and be alone. She was partying a lot and living her best life and I just wanted to be left alone. Last year, I reached out to her and apologized for ghosting her and she forgave me but didn’t continue the conversation. I miss her so much. It’s been a year since I apologized and I really want to be her friend again. But she obviously didn’t want to leave the door open by not responding after she forgave me. How can I let this go?