Write your own projects (ultimately written for others) in several different languages and follow your intuition. Growth is natural and unforced when it's driven by intuition and curiosity. It should never be forced or driven by comparison with others or the need to prove yourself. Even the most abstract things we do as humans are at root emotional journeys, so you need your emotional life to be healthy to grow. And learn several languages: C (you have, which means you have C++, Java, C# etc), LISP, Smalltalk, Python, APL, Forth etc, oh and math. Also, it never ends and you never "get there". Everyone is constantly learning and you cannot know everything.
