Thanks for reaching out. As you have recently switched your network, it is very likely that your Chromecast is still looking for you old network's SSID. You can change the Wi-Fi network of your Chromecast by following this step-by-step guide. If that doesn't work, you can try factory resetting it and set it up again using this step-by-step guide.
I hope you were able to connect your device with the steps provided by @listairee. If you have additional questions, feel free to respond to this thread and we'd be happy to further assist you.
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