Hey  @pikabun91,

You will need to perform a soft reset of your devices, and from there you can go to (+) Add Device in the Kasa app to setup the new wi-fi network.

 If you only perform a soft reset, your settings will remain, and you will simply be prompted to enter the wi-fi name and password. Even if you used the same wireless name and password as your previous network, you would still likely need to go through this process.

Take a look at this page from your bulb's user guide to see the difference between the two reset methods.

  @Grayslake,

Even if your network is the same there is still the potential for the devices to need reconfiguration, especially if your new network is using a different security method or encryption than your previous network. If your network was down while changing over, you may see if simply replugging the devices will allow them to connect with older credentials.

For Alexa, it would depend on the devices you are controlling. Many Alexa devices will use Zigbee, rather than Wi-Fi to communicate back to your Alexas - meaning they wouldnt be affected by a change in your Wi-Fi. 

With a soft reset to the devices, they will keep their rooms, automations, and names - you will simply be reconfiguring their wireless connection.