Users can quickly use the above method to fix the Kindle won't connect to Wi-Fi. It is also necessary to follow all the steps adequately.
https://ebookhelpline.com/kindle-wont-connect-to-wi-fi-issue/

If your Kindle Paperwhite won't connect to Wi-Fi, here are some steps you can take to troubleshoot the issue:

Restart your Kindle: Press and hold the power button until the device turns off, and then press the power button again to turn it back on. This may help refresh the device and resolve connectivity issues.

Move closer to the Wi-Fi router: Make sure you are within range of the Wi-Fi router and try to connect again. Walls, furniture, and other objects can interfere with the Wi-Fi signal, so try to minimize any obstructions between your Kindle and the router.

Restart your Wi-Fi router: Unplug your Wi-Fi router from the power source, wait for 30 seconds, and then plug it back in. Wait for the router to restart and try to connect to Wi-Fi again.

Forget and re-add Wi-Fi network: Go to the "Settings" menu on your Kindle, select "Wi-Fi," and then select the network you are having trouble with. Select "Forget This Network," and then try to reconnect by selecting the network again and entering the password.

Update your Kindle software: Make sure your Kindle has the latest software version installed. Go to the "Settings" menu on your Kindle, select "Device Options," and then select "System Updates" to check for and install any available updates.

Greetings,
Peter