Xfinity modem and google nest pro incompatibility

Three days of [Edited: "Inappropriate Language"] after A month of sporadic rolling outages between devices I called tech-support and got an AI bot. The bot put my Xfinity modem in Bridge mode, which caused all of my Wi-Fi to go out . Google nest pro’s all  flashing yellow now all of our home systems which rely on Wi-Fi are down Computers, TVs, etc.still no luck. Tried to connect to Xfinity gateway modem to take it out of bridge mode but could not. Xfinity support took it out of bridge mode for me, once I finally got a human after multiple circle calls with the same ai bot That broke my Wi-Fi completely to begin with. It’s infuriating that you have to argue with AI to get a real person when AI is what broke your Wi-Fi completely. 

I only Was in Bridge mode because they bought made that decision that it was what was necessary, but it crashed everything so Wifi goes to the modem and is visible on every device, but nothing can connect to it and none of my Google nest pros will work not even my primary when it is connected to the modem by ethernet cable.  We have even gone into all our devices to forget networks stop them start them, unplugged them, etc. nothing works. Who has Ben been through this that has a fix?

help! I’m in the dark ages here.