How do I (21M) apologise to that one person I wronged (19F)?

(deleted and reposted for more attention)

I had a good friendship with a girl which evolved into a situationship. We met on discord and we had good compatibility going on or so I thought, before we broke the situationship.

So basically, what happened is, I had a fit of naught and dm'ed her bestie as a joke. I was just meaning to fool around but she got angry and that quirk reminded her of her ex, and she started hating me after that moment.

I tried apologising countless times but she ain't buying it. She blocked me on all platforms, discord, insta, reddit and even whatsapp.

Though it's been nearly 2 months since this entire thing happened, it's been a bit hard to move on, because this is the closest I've been to a relationship (LDR but still). I miss our chats.

And while trying to move on, I even deleted her number so calling ain't an option, can't get her number again because i deleted chats too.

How do i change her mind and get back to her?

Edit: my own character flaw is involved too, for more details, https://www.reddit.com/r/TwentiesIndia/s/YhwUbKykzf