WiFi won’t connect

if it is not showing any WiFi SSIDs in your WiFi settings, then the WiFi adapter is broken, or if you are lucky, the WiFi driver need to be reinstalled.

If the adapter is defective, the tablet is toast. They don't have replaceable modules like most laptops do.

For Android, restart the tablet, forget/rejoin the network, or try a network reset in Settings; driver installation is usually automatic or part of system updates, but you be able to get specific firmware from the manufacturer if needed.