Life beyond SICP

I read SICP, which I don't regret, but I haven't moved any further since then. For a year I've been I've been toying around with languages like LISP, doing Project Euler tasks. Now, when I hear that my friends will write a compiler, a basic OS or collaborate to create a simple game, I feel I'm behind. I don't think that they will need my linear-time fibonacci numbers. What do I do now, /prog/, what do I do after SICP?

>>18
Actually, it's originally from an Anime, though I don't remember which one. Anyway, I'm just going to sage this thread now.