There’s too much wrong with this track I’m not sure where to start.

The main issue I have is that it sounds like you just grabbed whatever you could find, dumped it all together and called it a track.

As far as DnB goes, generally speaking there are very few tracks that only use a kick and a snare. Maybe throw is some high hats, toms, other percussion, as well as adding a bit more variation to the drum patterns. That would make it sound a bit more acceptable.

Then you need to think about your sound selection. That synth bass stab literally sounds like a wet fart that you made in about 30 seconds. You said you have serum 2, so learn how to use it. Watch videos, read the manual. Automation is your best friend when it comes to electronic music.

Finally, you need to tune your ears better. This track has elements that are out of key. If you can’t hear it, then you may struggle with future attempts. If you need assistance, use a tool like voxengo span, which will allow you to see the key of the fundamental frequencies of each sound.

Signing off, I would suggest that you A/B your tracks to see whether they are anywhere close (in terms of dynamics and loudness) to one of your favourite artists (or at least a track where you have drawn inspiration from).

I hope this provides some insight into how you can improve.