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It sounds like the drop may have damaged the screen and/or internal components of your Samsung Galaxy A53 5G. The fact that the screen goes dark occasionally and you have to tap the back to make it bright again is a sign that the display is damaged.
The best thing to do in this case is to take your phone to a qualified repair technician to have it diagnosed and repaired. They will be able to assess the damage and replace the necessary components.
If the damage is severe, it may be necessary to replace the entire phone. However, a good repair technician should be able to tell you if this is the case.
In the meantime, there are a few things you can do to try to protect your phone from further damage:
- Use a case and screen protector. This will help to cushion the phone from impact if it is dropped again.
- Avoid using the phone in extreme temperatures. This can damage the internal components.
- Be careful when using the phone around water. Even if the phone is water resistant, it is still best to avoid getting it wet.