I really wanna save this relation. what should I do?

I and my boyfriend broke up a month ago (we were together for 5 years). I was being toxic to him (for 1 year). He blocked me from everywhere except iMessages. I asked him if he wants to fix it but he is saying I lost him when I tested his patience.
I know he is mad at me. And doesn't want to talk with me. But there must be some way to fix it. I truly wanna save this relationship. What should I do? How can I make things back to the way they were?
I really wanna save this relation. what should I do?
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