Thanks for reaching out. Chromecast devices can only remember one Wi-Fi network at a time. If you change your Wi-Fi network and your device isn't currently connected to a Wi-Fi network, perform a factory reset and set up your Chromecast on the new network. You may check this support website article to learn more.
Just checking in to make sure that you've seen our responses. Please let me know if you have other questions or concerns as I will be locking this in 24 hours if I won't hear back from you again. Feel free to start a new thread and we'll be happy to help.
I appreciate the help, Jennifer and Jeran.