Hi ERJN2,
I'm not sure unlinking would be the best available option. When you unlink a platform account from your EA Account, you can link it to another EA Account, but your in-game progress will not transfer over. Please see these EA Help guides for more about unlinking and Steam:
Before opting for that, our support team could try to help you recover access to the EA account and update the information from there. Please get in touch with our support team for help on this one. This guide will share more on how to reach with the support team:
- EA_Lanna