Face ID and your Apple ID password are entirely unrelated and not connected in any way.
If you actually forgot your Apple ID password, then see here: link-> If you forgot your Apple ID password - Apple Support
For Face ID what you had to have set up is a screen unlock passcode. This only lives on the device itself and cannot be reset or recovered. You will need to erase the iPad and set it up again to remove the passcode.
If your iPad is running iOS 15.2 or later you can erase it directly from the iPad Lock Screen: link-> How to remove your iPhone, iPad, or iPod touch passcode without a computer - Apple Support
Otherwise you will require a computer with iTunes to restore the iPad and remove the passcode. There is no way around this requirement.
Link-> If you forgot your iPad passcode - Apple Support