Inside of my iphone is ratteling after I`ve dropped it and it wont turn on.

So basically I have dropped my iphone 11 pro max on the floor by accident and initially Ive just turned it on and it worked fine for about 10 minutes and then it suddenly turned completley off. There is a rattle inside the phone when I shake it and when I manage to shake it into a specific place(the detached part inside) i can turn it on; however even the slightest shake from there on just turns the phone off. My question if anybody knows what is that rattly part inside and also can it be fixed or should I just buy a new phone.

Also on phonescreen there is a bright green line on the side when it turns on.