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Do it step by step.

Find a challenging enough problem on the next level to solve. For example, create a simple computer game, or simple web app, i.e. chat app in a browser. Approach it with the architectural mind set, i.e. first think how you would structure it, which components you will need. Then implement. If it goes well, find the next problem, if it doesn't take a look at similar OSS solutions. Study them, think about tradeoffs they made, and after learning from them try again.

P.S. Don't do more complicated scripting. I would say scripting is an area of its own. My understanding is that you want to get to more of an application development.