Enabling WPA3 on the wireless network provides robust security through stronger encryption protocols and represents the most up-to-date security standard among listed options, thus effectively preventing unauthorized access while maintaining the integrity of the network's internal resources. Changing the SSID and disabling the SSID broadcast may obscure the network but do not provide encryption or truly secure the network. While disabling UPnP might reduce the surface for potential exploitation, it does not directly prevent unauthorized access to the network.