My samsung galaxy ace 4 is not turning on

My phone was 76% charged, it was not fully charged i had to go out so i plugged it to fully charge. after 10 minutes my sister was screaming to come out quickly so i had to unplug my phone from the charger. (i don't know if it was fully charged or not) i came out running from my room and accidentally dropped my phone from my hands (it was not dropped it just kind of slipped from my hand, i tried to save it from falling i nearly caught it with my legs) that is why it was not dropped very hard n the floor. After that my phone has gone black. why?

I have Tried rebooting method (volume button, power button etc). I also tried charging it and putting out battery for minutes and then replacing it again.

What should i do?