That's it, but not really. There are so many more projects you can now tackle as you have the basic capability in hand. You learned how to build simple robots that can roam around on wheels and even walk on legs. You built robots that can sense barriers and communicate with the outside world wirelessly. You also built robots that can sail, swim underwater, and even fly. However, you've really only just begun. There is plenty of help out there as well and almost as many different forms of Arduino as there are projects. So, feel free to create.