Steam doesn't remember me .

So My PC had a problem and when it was adjusted I opened Steam with my account, all games worked apart from Action Taimanin which In the Moment I opened it made me restart from Rank 1, I don't remember my nickname I was beetween rank 54-70 and I had 2 characters already at level 81, i wasn't very dedicated to the game but I have been playing for 2 years and I am really sad. Can anyone help me?