Also, I would love the opportunity to really test the skills I learn in a learning flow.
From what I can see (correct me if I’m wrong, because I haven’t finished the flow yet) a learning flow is mostly about following along with tutorials, doing very specific exercises with a set subject. Which is perfect for learning the fundamental skill-set needed to become proficient with creating in Blender. But I think it would be awesome to have some final ultimate test, which becomes available after you finish all the courses of a learning flow. A personal project, graded by one of the instructors (or the community, or both).
For example, after the ‘Modeling in Blender’ learning flow, the final test could be to model your own subject. It can be anything you want, you can use any technique you want, as long as it showcases that you really mastered modeling. To proof this, you would have to provide a couple WIP’s, a Sketchfab link and a final polished render. Maybe you could earn some extra credit/XP for shading/texturing/lighting.
This way you would be stimulated to create your own 3D models instead of only following tutorials. You will also get feedback on your work (would be great if this would be a requirement to do when grading this kind of final test), which will really help you learn and is (in my opinion) crucial to become a better artist.
And as a bonus you have a great render to put in your portfolio as well!