Hello Lex,
Replacing the antennas won't help. The software won't help either. You have a broken interposer or the connection to it is not continuous. Take it to a good repair shop. Within an hour, your phone will start working normally again.
Sometimes it happens that the old versions of the application on the phone can not work with the new IOS 16. The problems that arise can be different: from battery problems to WiFi and general phone disruption. Reset the phone to factory settings and do not restore from a backup. Install new phone without icloud and face.ID - For trial only. If nothing changes, WiFi and BT will not return, use the hint above.