I don't think I can help you with this one.
The thing is: If a total stranger like me went to that person you want to reconcile with but refuses contact with you, guess what, that person would then probably block me and still would not talk to you.
This is not about who I am and how good I am at talking to somebody.
This is about the signal you'd send even if you don't want to: "I wanna talk to you but you won't let me because you are mad at me. So here I send this stranger to you to talk for me. Will this change your mind?"
I recommend to let a bit of time pass...maybe the anger will pass, too. Then you can try again with contacting.
If that person then still denies contact with you or does not react, then unfortunately you must consider accepting this situation.