I’m afraid there isn’t a way to force users to go through the Discobot tutorials currently.
It is possible for a user to trigger the tutorials at any point as long as they don’t have ‘Skip new user onboarding tips and badges’ ticked on their Preferences/Interface page. For that they would need to type either:
@discobot Start Tutorial or @discobot Start Advanced Tutorial
in a topic or PM for discobot to send them a fresh one. 