Where should my rock-ish song go next?

http://www.b3ta.cr3ation.co.uk/data/mp3/5b8398f9be6e866a89c2a2c93b52ffd0_fasteronewithunfinishedbits.mp3

There's a mixture of recorded and MIDI guitar that's not going to be present in the finished cut here, and a timing anomaly I hope to fix with a re-record of the guitar parts, but besides that, where do I go next? I don't want to write one of those songs that's just an endless repetition of my riff, but I've just put a lot of effort into the B-sections and I need a starting point for the next bit now I think.

Also, besides answering the question, let me know if you like it :P

edit: Also, I was thinking of fleshing out the piano a bit, does anyone have any tips as to how to make it sound more like a complete instrument than just the means to a single melody?

Sounds kind of like trippin on a hole in paper heart by the stone temple pilots mixed with the charlie brown theme.

I like it so far. Does it have a part for a singer?