[angelofm]

you just asking about one thing, in my experience there are many different factors that contribute to become a good developer, but if I had to choose one would be "challenge yourself".

No matter the task or how hard it is, you can do it. Think about it and let it settle in your mind, YOU CAN DO IT.

When you face IT projects and challenges with that set of mind every thing else just falls in place, the only thing you need is challenging projects, find those either at work or outside of it.

Best of luck.