I dropped my phone on the power and volume buttons.

Yami no Shinobi let us know the exact model for your Tab 4. You will have to disassemble it and inspect the damage closer. The buttons may only be dislodged and could possibly be reinserted but it will depend on what you find. Post some CLEAR pictures of the damaged parts once it is disassembled.

Check to see if there is a small gap between the glass screen and plastic bezel. If there is, the back is simply popped out of place. Using light pressure, place your thumbs on the front screen and the rest of your fingers on the back and push the back up and in. A small “click” will let you know if its back in place.

Hopefully this is realign the plastic buttons so they work properly.