how to delete the apps all data?
Most apps like that do the registration server side and you would need To erase the device entirely and not use the same Game Center account. 

Deleting the app does delete all data unless it’s designed specially and in that case, you need to know exactly what bundle and delete the data from iCloud on a mac, not from iOS. 

In general, deleting the app deletes all data. Especially if you don’t enable iCloud.