As far as I know, the only sure way to do this is to install a more user friendly version of Android such as LineageOS or Graphene OS.

I have been intending to try and find out if it's possible to manually delete files associated with an app that can't otherwise be removed but information on doing this is hard to find. I expect the method would either be by way of adb or a rooted file utility but you have to have a way to figure out exactly what files to delete and where to find them.

It also would be nice to have more information about what this Device Care actually does.

My Devices: Samsung Galaxy S9 - LineageOS 20 (Android 13) Samsung Galaxy Tab A8 - Android 14 HP EliteBook 850 G4 - Android x86