Hello!
Okay, first thing I noticed about this track is that the drums are very, very weak. That kick is almost non-existent, and I had to hear real carefully to hear it. Get a deeper/snappier, stronger kick and snare sound. As for the hi hats, make it play on every beat (or just a really fast pattern will do). Oh, and have some dynamics in the beat too (like, certain snare hits being quieter than the others).
I have hearing problems, and I'm not sure if you had a bass in this. Throw in a Reese bass, or maybe even a harsh, distorted/buzzy one.
I've got nothing to say about the melody, though.
As for other tips, keep listening to DnB tracks. There's plenty of DnB mixes over on YouTube. Have a listen to any of them, and find the similarities in them.