Unable to connect or find any nearby Wi-Fi networks

The fall may have caused some internal damage, which would best be confirmed by scheduling an appointment at your closest Apple Store Genius Bar --> Genius Bar Reservation and Apple Support Options - Apple

You can try the suggestions in this link first, but I suspect the fall damaged your phone --> If your iPhone or iPad won't connect to a Wi-Fi network - Apple Support

There is a good chance that the fall broke or dislodged the internal Wi-Fi antenna connector or cable inside your phone.

Make an appointment at the Genius Bar or take the phone to an authorized Apple service shop. You can find a list of authorized shops in your area using this link: Find Locations - AppleAppleFind Locations