If your Mahjong Club app progress has reset to 0 and you're looking to restore your progress, here are the most effective steps based on common solutions and reported issues:

- Check Cloud Sync or Account Connection: Most mobile games, including many Mahjong titles, sync progress to an account (Google, Apple, Facebook). If you previously connected your account, try logging in again through the app's settings using the same method you used before. Look for options labeled Save, Connect, Data sync, or similar. When prompted between server or local data, choose the option with the higher progress158.

- Confirm Login Accounts: Sometimes, progress fails to restore if you are logged into the wrong profile. Double-check in the app and your device settings that you are using the correct Apple, Google, or Facebook account. This is essential on both iOS and Android devices5.

- Restart and Reinstall: Restart your device and log out/in to the app. If progress is still missing, delete and reinstall the app, then log back in with the same account. However, if the app was not previously connected to an account, this may not restore progress53.

- Developer Limitations: Some users have reported that for Mahjong Club by Gamovation, logging back in with their Apple account did not restore progress, and the developer claimed that due to privacy policies, they couldn't recover data3. If this applies to you, direct recovery might not be possible without backup.

- Contact Support: If the above steps fail, contact the app's customer support through their in-game help or website. Provide as much detail as possible about your account and device. Some developers can manually help recover progress if you have proof of account ownership13.

- Prevent Future Loss: Always link your game progress to a cloud account if possible, and use in-game options to manually save or sync game data when available518.

> “If you've previously connected your account, you can...restore your progress. If...not, contact our customer support team by clicking the 'Chat' button. We will do our best to assist you!”1

Note: If you played as a guest or never linked your progress to a cloud/service account, restoring lost progress is usually not possible after a reset, especially if the app has been uninstalled or data cleared.

Summary:
- Log in with the correct account in the app.
- Use the in-game restore/data sync option.
- Reinstall and retry if needed.
- Contact support if nothing works.
- If your data was never linked/synced, recovery may be impossible.