Feature request: a compromise instead of letting people reset their accounts

I would like to reset a specific course I worked on 4 years ago. No, deleting my account or creating a new one would not work. I have other recent coursework I don't want to delete, being halfway through, and as to a 2nd account - I don't think juggling 2 accounts would work on a phone (unless Khan Academy has an account switcher like Google?)

Proposal - the main thing I want from a course reset is a way to easily tell where I am while I go through the course a second time. This mostly means an indicator of which videos I've watched. What if there was a way to reset a course that only reset which videos were read vs unread, but left all the quizzes and exercises as-is? This would fix 99% of the issue for me.

Or if that is unpalatable, what about a marker to indicate the furthest video I've seen in a course. Instead of resetting the course or which videos where read, you could reset just this marker.

OR if that is too unwieldy, what about the ability to bookmark to a single video or quiz? If I could do this, I could manage my place by setting new bookmarks. It would be a bit awkward, but it would work.