When I return to my learning after a break, or sometimes even a weekend, I forget which course I was last working on. Similar to the feature on many a steaming platform, having a "Continue Learning" feature on your dashboard with your last course on it would help people pickup where they left off. You have a "Featured Courses" section on the dashboard: you could add your most recently viewed course to this section as well.

Similarly, a bookmark function would allow users to mark courses they want to take at a later date. The more your course library expands, the more important it is to add features that aid in navigation.