Dropped my iPhone 5s now it won't turn on

I dropped my 5s and the screen cracked a bit but it worked great after. Recently it fell out my pocket and dropped flat on its face and cracked a bit more again . I tried turning it back on it vibrates and the screen light faintly came on , I couldn't see the apple logo or anything and phone was overheating at the same time . The phone overheated to the point I couldn't hold it any longer in my hand. I tried an hour later and the same thing happened. Left it for a day and tried turning it on again but nothing shows up, won't vibrate , screen is black, won't charge at all. Tried iTunes computer won't recognise my phone. Hard reset , nothing . Tried everything. No warranty . Thought of replacing the screen but don't know if that would fix the problem. Help please