What if I don’t know my old iCloud account and password to activate my old I watch

Hello reanel32,

You can try to reset your iCloud password.

The following Apple Support documents may help resolve your issue:

Reset Password -> https://iforgot.apple.com/password/verify/appleid

Forgot Apple ID -> https://iforgot.apple.com/appleid

If those did not help, Contact Apple Support:

-> Contact Apple for help with Apple ID account security - Apple Support

You can ask apple to remove the activation lock online on this page;

Remove the Activation Lock Here.

Or this;

If you can't remember/gain access to the apple id that paired the watch to the phone.Take the watch and it's receipt with the serial number along with some photo id and any other proof of ownership to an Apple Store and request that they remove the Activation Lock for you.