Hi CallCIA,
Sorry to hear your account was compromised and the Steam link was changed.
I wouldn’t recommend linking your Steam account to a different EA Account just to get around the linking restriction. Battlefield progress and content are tied to the EA Account where they were earned, so linking Steam to a different EA Account may result in losing access to that progress, Battle Pass content, and other items.
Since the unlinking happened while the account was compromised, please make sure your EA Account is fully secured first:
What to do if your EA Account was hacked
You can also review the account-linking restrictions here:
Troubleshoot EA Account unlinking issues
If you still can’t reconnect the original Steam account because of the waiting period, select Contact us at the bottom of the guide and explain that the link was changed while the account was compromised.
You can also use this webform if needed.
As ElliotLH mentioned, please make sure to have the relevant information and evidence ready before contacting the Support Team.
Please avoid making any further account-linking changes for now. I hope you’re able to get the original Steam account linked back without affecting your Battlefield progress.