If your game account data was reset it could be because you either changed your device or logged into an account other than the connected account you were previously using.

Please check if the account you’re currently logged into is the connected account you were using.

If not, please log out of the current account and log into your existing account.

HOW TO LOG OUT

 1. Menu at the bottom of the screen → Account Info

 2. Press Logout from your connected account