Hey @email@example.com! What you just described sounds like a great use case for Visual Automation Events. With Events, can set up a Visual Automation such that if the Subscriber(s) in it receive a particular tag at any point, they'll automatically be pulled out of any Sequence they're going through within that Automation, and pulled forward straight to the Tag Event step (and then further steps can occur after that Event).
This article goes over how Events work, with guides and examples: Visual Automations Events213
Of course, let us know if you have any other questions!