My battlefield 6 has restarted my game progress

Hi rose-may27​,

Sorry to hear your Battlefield 6 progress appears to be missing.

The first thing worth checking is whether you’re signed in to the correct EA account and the correct platform account.

Since progress is tied to the EA account, issues like this can sometimes happen after platform accounts have been unlinked or relinked. If that may apply here, this article may be helpful:
Understand the risks of unlinking an EA Account from a platform

If everything looks correct and the progress is still missing, the best next step would be to contact the support team so they can take a closer look at the account side.

Hope you’re able to get it sorted out soon.