Iphone 7 dropped on the floor wifi is not working

Hi, I accidentally dropped my iphone 7 on the floor, and the wifi connection snapped.

I have tried to on/ off wifi but it was grayed. Then, I tried to reset the network connection so it restarted, so it wasn't grayed anymore. However, it only connects to a wifi network for a while and it suddenly disconnects and fail to search available networks. And sometimes it even shutdowns when I try to open the wifi. What should I do? I already "erase all contents and settings" . I would appreciate your kind help. TIA