My iPhone 7 will not stay on
About a month into having a brand new iPhone 7 i had dropped it an cracked the screen a little. When I'm using it the part where the screen is broken lights up differently. You can tell something is wrong. I went a few months like that and ended up dropping it again. Days went by and my phone would turn off around 40% then 60% and now it won't stay on for more then 10 seconds without being on the charger. It doesn't have the powering off spinning circle when it turns off it goes completely black. I don't know if i should replace the screen or if its something else. I don't wanna spend unnecessary money on the wrong things. please help. Is it the LCD cord detaching or is it my battery??? I'm so clueless. Also if the top left side of phone it looks like its coming up a bit.
another thing is iv only had this phone for 6 months.