Improve the finding new courses experience
I don't know what the answer here is, but I know the "Browse All" page can be improved. There's a lot of junk courses in the lists and it's a pain to scroll through all the courses that are irrelevant.
It would be great to have a "recommended sort" which gave the courses you might want to actually take first. If you had the data on enrollment numbers, you could order by popularity. If this gets used enough, you can start doing some fun ML stuff for recommendations, but you'll need a ton more data for that to be effective.
Don't limit yourself to just changing the sort order though, there could be many better UIs for finding new courses to take.