Backstory: About 2 years ago I became close online friends with someone over Steam and Discord.
Recently (4 days ago) we got into a disagreement; I overreacted and he responded by blocking me on Steam. I sent an apology to him via Discord, including asking him not to block me on there so we could talk about what happened, but this was met with being blocked on Discord as well.
Personally, I take responsibility for this, and I feel both guilty and anxious about it. I'm really scared that he plans to keep me blocked for good. I've been told that waiting is the best thing to do right now but I'm tempted to ask a friend of his to ask him how he's doing and if he plans to talk again sometime soon, or maybe send an email asking these things.
How exactly can I approach him when I reach out (seeing that the initial apology completely backfired)? I fear that when I try to contact him again, he will completely and permanently shut me out of his life. Therefore I am searching for ways to apologize to him where the chances are highest for him to accept my apology, since it might be my last chance to contact him.
The solution can be about contacting him directly, or via his friend.