Currently, there is no way to completely deactivate your Watson Workspace account. We'd be sad to see you go, however, you can uninstall the mobile apps and delete any spaces you have created at any time. You can also leave all spaces you have been added to. Leaving a space does not remove any of the messages you have posted or content you have shared.
If you want to clear your IBMid profile information, visit your My IBMid Profile.