Start a Project
We can learn many things from a programming course. Still, completing a project takes our learning to a whole new level.
If you have a project you want to complete, start researching how to make it happen.
I find the Mozilla Developer Network (MDN) to be an excellent source of documentation and tutorials on many web-related subjects. If you're going to set out on your own, I suggest keeping this link handy.
Crush more Katas
If code katas got you this far, why not take them to the next level?
Now that you have these essential skills, why not use them to tackle greater challenges?
Play a Game
We need to be engaged and interested in order to learn, and games are naturally engaging.
Why not practice your coding skills with a real-time multiplayer game?