"I understand how frustrating that must be! If you synced your Opera data before formatting, it should have been saved in the cloud. Here are a few things to try:
Check Opera Sync Settings: Go to Settings > Synchronization and confirm that you’re logged into the same Opera account.
Try Syncing Again: Sometimes it takes a bit for data to sync properly after a fresh installation. Make sure your internet connection is stable and try syncing again.
Check Opera’s Sync Server: If the data still isn't syncing, check if there’s any issue with Opera’s servers or outages that might affect sync functionality.
Opera Support: If all else fails, contact Opera’s support team with your account details to see if they can restore your data.
Hopefully, they can help you recover your information!"