Some quick tips about DnB.
Here's some quick and very brief things about drum 'n bass:
Do not use that bass that you have in there. All it is is a saw wave. You have to add on many more effects to make it sound really good. If you want a deep and subtle bass, try putting a lowpass filter on something that you have messed around with a bit, and if you don't get as an audible bass you want, you can add a really low sine wave (and only a sine wave, no effects needed) to get the sub-bass sound you might need. If you want to get some crazy reece's going, you can try looking around for tutorials and getting new VST's (like Hotelsinus Reese Bassline), but all you really need to do is practice putting something like two detuned saw waves and adding a bunch of effects over it.
As for the drums, you can probably get really good with putting drum loops together. It isn't the greatest here, but it's a really good start. Try throwing in some more variety; more patterns, drills, rolls, ect, just to throw together a more interesting song.
That's about all I can think of, keep practicing.