Google Nest Community

first enable airplane mode that should break all data connections and protect your network if its not to late. next use a trusted device log on to google. You can sign out of all Google services by managing devices in your Google Account security set...

For maximum security you need to make sure you're securing your all your iot devices if you don't secure those they can have bugs in the firmware that can be compromised and your network can be taken over from that best practices to have it on a VLAN...