If you've already changed to a different Wi-Fi network, try these steps:
1. Open the Google Home app.
2. At the top left, tap Add + > Set up device > New device > set up new devices in
3. Follow the in-app steps.
If these steps above don’t solve the issue, you’ll need to factory reset your speaker or display, then set it up again using your new Wi-Fi network and password.
Instead of factory resetting your speaker or display, if you're comfortable changing your router settings, you can change your new Wi-Fi network name and password in your router's settings to be the same as the previous ones. Your device should then automatically connect to the Wi-Fi.
If you've recently changed your Wi-Fi password, your Google Home or Nest will not be able to connect to the internet. No button exists on the device to easily reconnect your Google Home to your router. Instead, you'll go into the Google Home app to reconnect your device and get it functioning correctly again.