Answer:
disable SSID broadcast and change the network name
Step-by-step explanation:
Based on my experience with information technology and wireless networks my recommendation would be to disable SSID broadcast and change the network name. Disabling SSID will prevent the network name from appearing on devices that are searching for a network to connect to, and by changing the name it will also prevent anyone who knows the previous name from connecting unless they know the new name. Both of which will drastically increase security.