@motherofscience
Unfortunately, Google Nest does not make it easy to change Wi-Fi settings. That's why their first recommendation when getting a new router/modem is to set the network name (SSID) and password on the new router/modem to the same values used on the old router/modem.
If you can't do that, then the basic process is to remove your cameras and doorbells from the Google Nest app or Google Home app (as appropriate) while still on your old Wi-Fi network, do a factory reset on each device, and then reinstall them.
The factory reset process varies, and glitches can occur on the reinstall.
https://support.google.com/googlenest/answer/9223711
https://support.google.com/googlenest/answer/10165378?hl=en-IN&sjid=16702723070552732368-NA#zippy=%2...
