Black Screen But Still Powering ON

Hey,

I dropped my iPhone 5c like 3 years ago, I know it's a while ago, but I want to repair it ;)

That's how it stopped working : I dropped it at about half a meter from the floor on my carpet. Then green lines started going all crazy on my screen and the display became black (there is still light but it's black), but the phone was still playing the music I was listening to... Then I got mad and bought a new phone since it costed $129+ to replace the screen at Apple and my 2 years contract was about to end.

Idk the problem... Idk if maybe one cable of the screen unplugged or something like that.

Oh yeah, forgot to say, my screen seems a little bit out, I can actually push on it but it doesn't go back in the rear case...

What can I do? Your help will be appreciated :)

Thank You!