As a service, we don't know and we don't store your Master Password anywhere. If you don't remember your Master Password, you can recover your access to pCloud Pass with the recovery words you received during setup. Just enter all recovery words in the right order. If they're correct, you'll be prompted to create a new Master Password and access pCloud Pass.
Unfortunately, without your Master Password or your recovery words, there's no way to recover your access to pCloud Pass. In this case, your only option would be to reset pCloud Pass and start from the beginning.