I suspect my account has been hacked, but I still have access to it.

A while ago I was playing Apex, and my rank was at Gold 1 before I took a break for a few weeks. When I logged back in, my rank was suddenly Diamond 2, and Agent Axle was unlocked—an agent I never had before. My current season stats are also abnormally high despite me not playing for weeks. Fortunately, I still have access to my account. Could you please help me secure it? Also, I checked my login history on both Steam (which I use to play Apex) and my EA account, but no other devices were connected. Only my own device appears on the list, with no suspicious logins shown. Thank you.

I Already change my Steam Password, Email Password, and EA Account Password..