Account hacked & boosted

Hey, y'all, so I was thinking of getting back into this game after not playing for a few years, but when I logged back into my account, I found out that someone had been using my account info, so obviously I changed my password, added 2FA, and all that, but I was left with the issue that whoever had been using my account had climbed to diamond and back when I played this game I was like gold/plat and even then that was like 5 years ago.

So now idrk what to do since I do wanna grind rank again with my friends, but I don't really want to que into rank and throw all my teammates' games since im in a way higher elo than I really should be in.