According to Multiplier, and other producers, one of the mistakes that can be easily avoided when making Drum and Bass is not adding enough variations for the drums.
It’s simple advice but will take you far. Create lots of variations on the drum track and sprinkle these throughout the track to maintain audience interest.
In the above video tutorial from the complete course Dance Music Styles 104: Drum and Bass, Adam Pollard (aka. Multiplier) demonstrates how tiny changes, fills and experiments on the drum can prevent a long Drum and Bass track from becoming too predictable to listen to.