Buildup, climax.......
Then nothing in particular. As dissonant wrote, it really needs something powerful to release the tension. Either a heavily distorted guitar or a powerful arpeggiated synth.
Have you tried distorting those drums a bit? It could yield some interesting results.
Oh, and turn up those background synths a little bit (all other ones besides the one that sounds like strings, which is perfect at the volume it is) because the drums are loud.