How do I win an ex back after a rough ending 4+ years ago?

We were engaged, in our Early 20s. Not been able to fully get past or move on. Every relationship I've had or tried has always came back around to her somehow even after I had thought I was past that.
I've given in to the fact that she was really it and I need to figure out how to fix it.
How do I win an ex back after a rough ending 4+ years ago?
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