I can’t pair my Apple Watch and forgot the password

If you forget your Apple Watch passcode - Apple Support

You can restore the watch from a previous backup if you have one.

M1 Mac mini, macOS 13.3;  Watch, series 7 GPS/cellular, watchOS 9.4; iPad Pro 2nd Gen, iPadOS 16.4; iPhone 12 Pro, iOS 16.4; TV 4th Gen, tvOS 16.4; HomePods, audioOS 16.4 and Airport Express w/ Airplay 2