iPhone Problems after Screen Replacement

So my phone dropped on the ground and my phone started to be unresponsive to touch at times (many times). I couldn't obtain a warranty because the damage wasn't covered. After a few months, I decided to try fixing my iPhone's screen but after reconnecting the flex cables back, my screen works again, but now my speaker and front facing camera does not. Anyone has any suggestions on how to fix this? My phone also does gets very hot. I also lost a screw in the progress.

I know it was wrong for me and I learnt from my mistakes.