Needs a bit of work

the problem with this track is how it feels somewhat random for the most part. It feels like it needs to be a part of a proper scale. If I were you, I'd study the major scales and write a song based off those first. The faster melody that comes in towards the end feels like it might be part of something, but it feels empty without any form of backing instruments, such as pads, synths, keys; anything that goes along with a typical DNB track.

Also, you're gonna wanna add in a drumloop. For DNB, its pretty easy to make, you just need a kick drum and a snare drum, and place them like so on your sequencer.

X = Where the sound is placed.
- = gap.

Kick: X--- ---- --X- ----
Snare: ---- X--- ---- X---

Which should result in your typical pendulum drum loop.

The bass sound itself is OK, but sounds cheap by itself. If put with other sounds, you could actually make a pretty nice sounding track from it.

Keep practicing though, I'm certain you'll get a lot better if you keep working towards your goals.

Okay.

The melody is okay, albeit a little common, and I'd recommend a completely different instrument. One with lots more energy.
Also, you need;
1. A proper drumbeat.
2. Some kind of pad to fill the gaps.
3. To make it a lot longer.
That's all I can think you need so far to make it good.

-Aaroca-
Good luck!!