Playing again after a few years; All cosmetics and progression is missing.

Hi so recently redownloaded the game after a ban was appealed (after 4 years of trying) and to find my account is at lvl 1, with none of my cosmetics I had previously purchased or even my stat trackers. (Those were most important as they had silly season 1 items you can't get anymore.)

Is there any way to get all my items back or am I just boned cause the account got hacked and banned years back. 
I don't think I've ever unlinked/linked this account to anything but my steam account. 
Thank you for your time.