Can't

Hey @queenfart1111,

If you're unable to unlink an account from your end, you can try contacting support directly so they can help get the correct account(s) linked. Depending on the account status they may need to change this on their end.

Do keep in mind that progress is stored on the EA account level, not on individual platforms like PlayStation, Xbox, Steam, etc. This means if you link your platform to a different EA account, you'll lose access to that progress. 

In this case it sounds like the EA account that has your Steam profile linked doesn't have much you'd be missing, just be aware none of that content would come over to your main EA account when re-linking Steam.