Hi there! I see that you've already tried deleting and reinstalling the WeightWatchers app and restarted your Android phone, but it still won't open. Let’s explore some additional steps to get this resolved.

1. Clear App Cache and Data:
Sometimes leftover cache or corrupted temporary files can cause the app to not open. Here's how to clear them on Android 10 with WebKit:
- Open your phone’s Settings.
- Go to Apps & notifications (or just Apps).
- Find and select the WeightWatchers app.
- Tap Storage & cache.
- Tap Clear Cache first, then Clear Storage or Clear Data.
- Try opening the app again.

2. Check App Permissions:
Insufficient permissions may prevent the app from running properly. In the same app info screen:
- Tap Permissions.
- Ensure the app has necessary permissions like storage, location, and network.

3. Update Your Device OS:
Make sure your Android 10 OS is up to date as some apps require the latest patches to run smoothly. Go to Settings > System > System Update and check for updates.

4. Check Internet Connection:
Sometimes poor or restrictive network can stop apps from opening. Ensure you have a stable WiFi or mobile data connection.

5. Reinstall from Official Source:
Just to be sure, download the app directly from Google Play Store to avoid any installation issues.

If after these steps the app still won’t open, it could be an issue with the app’s compatibility or a temporary server problem on WeightWatchers’ side. Occasionally waiting a little while or reaching out directly to their support at [email protected] helps.

Would you like me to guide you through clearing the app cache and permissions on your device now?