Regarding Steam Account Binding Issues

I used my A email address to register my Steam account and purchased Battlefield 6, which I've played for over 100 hours.

Then I linked the Steam account registered with email A to the EA account registered with email B.

After reopening Battlefield 6 on Steam to play, I discovered my account level had been reset, and all previously earned in-game rewards had been cleared—it was essentially a brand-new account.

How can I recover my Battlefield 6 game data from before I linked my EA account?

Thank you very much for the staff's answers and support!