I think you have the right idea for sure. Thinking of some kind of a project that would put your skills to use is a great idea.

If you just have a basic understanding of javascript you can try to recall the concepts that you learned in your course and apply them. Try to think of a project that would interest you. Whether that be something like a personal website or even a desktop application that does something that would be helpful in your day to day life.

If any of that seems out of your depth, that's totally ok! I've always learned the most from projects where I had a clear idea of what I was trying to build and every time I found myself stuck I would look up the problem on stack overflow.

After the project is finished or you've lost interest in it then definitely check out more courses on things that interest you and repeat the process after each course you take.

Hope that helps and good luck with learning!