Reset your AirPods – Apple Support

Go to Settings > Bluetooth and tap the “i” icon next to your AirPods. 2 Then tap Forget This Device, and tap again to confirm. Reset your AirPods With the lid open, press and hold the setup button on the back of the case for about 15 seconds, until you see the status light flashing amber.

https://support.apple.com/en-us/HT209463