Facebook stores its cache files to prevent high data usage. This cached data helps the apps work according to their interests, and the apps save all your information in the data. When your device's cache data is overloaded, it must be cleared to function properly. Follow the below steps to clear the Facebook cache on your Android device.:
1. Open “Settings” on your device
2. And visit the “Apps and notifications”
3. There search for the “Facebook app” and click on it
4. Tap on “storage and cache”
5. Click on clear cache
Here, you can also read some troubleshooting for Facebook such as how to unlock temporarily Facebook account.
Read here: https://getassist.net/facebook-account-temporarily-locked-how-to-unlock/