You've now learned the basics of programming! More importantly, you've learned how to learn how to program: by reading tutorials and trying stuff out. My hope is that programming seems a little less like magic now, and if you've had fun so far, you can keep going with it.
Here is a list of things you could try- which option you choose depends on what you think is the most fun!
This Hour of Code is basically a super-condensed version of The Static Void Games Tutorials. The Hour of Code is meant to introduce you to the basics, and if you want to keep learning just like this, the tutorials are your best bet.
The Hour of Code has introduced you to a few variables and methods at your disposal in Processing, but there are many more. Check out the Processing Reference for a list of other variables and methods you might want to try out.
Static Void Games contains a bunch of example games and programs, many of which are open-source. OpenProcessing is another great source of Processing sketches done by other people.
We've seen how to make a game in Processing, but one of its main uses is by digital artists! If you've been to an art exhibit that had digital art, chances are you've seen Processing in action.
For example, Aaron Koblin is one of my favorite digital artists, and here are a few of his projects done in Processing:
All of the above projects were done in Processing! The Processing webpage lists a bunch of other art projects, and googling "art done in Processing" returns a bunch of interesting results as well.
I think Processing is a great language, but there are other languages out there. Different languages are useful for different things. Here are just a few:
There are many other languages, but the above are where I would start.
There are an infinite number of things you can do with programming, so it might be pretty hard to decide what to do next. Instead of figuring out your next step, try thinking about your end goal: what sounds the most interesting to you? Creating a game? Creating a phone app? Visualizing some data? Making some kind of art?
When you have a goal in mind, then you can break it down into smaller steps that you can google. Googling "How do I do XYZ in Processing" will get you a bunch of results.