…your wish is my command!
Why not give yourself one week off from the course, but then use that time to create some more individual non-course related models. Then, at the end of the week, return to the course again and see how far you got.
At this stage I’d recommend just experimenting, playing and learning to be honest. After learning a very small set of the basics I took a break from the Characters course and started on a little piece of scenery, I read a couple of articles online about removing ngons, ensuring quads etc, I got so bogged down with trying to make the model perfect that I really lost the enjoyment for a while. Prior to this I’d really enjoyed making a little Lego character and a snowman, the latter being so simple but it was fun and that kept me enthusiastic and wanting to do more.
Everyone is different and will have different goals, learning styles and so on, but if you enjoyed what you did with the Goomba maybe continue that way for a little while longer and then gradually introduce more advanced techniques.
I do, of course, now want to see Donkey Kong, Mario, Luigi, Princess Peach, one of those angry looking bombs on a chain and so on… get to it!