For Face ID issues, I would either get apple to fix it, or see if you can salvage the camera by your self. Like @barriphone stated "Your front camera and earpiece speaker/proximity sensor assembly cable is paired to the motherboard you can't change the parts because you will lose face Id." If you break the camera while trying to replace the screen, you will lose Face ID. Could you upload a picture of the top of the screen by where the camera assembly is located?