Well if you wanna up the tempo, I'd suggest doubling the speed of the drums haha. I'm not listening on the greatest headphones so I can't comment that well on the mixdown. It sounds fine from earbuds
the sound production seems dated, it sounds more like an ambient tune from the 90's to me.
I would suggest to get more of a minimal dnb vibe to work on your drum production. Right now they seem really bland and slow for a dnb song. Try listening to some popular minimal tracks and try to mimick what they do as well as look up some tutorials on youtube on how to make drum and bass drums. Once you get a better idea of what other people are doing you can more effectively stray down your own path while still having a polished sound.
A little bit more variation in the tune would also be welcomed. Even just some sort of automation on the original instruments you have, or adding a different sound to play the same thing would make the track more interesting.
As a side note, I'd actually say some of the sounds are kind of 'muddy' sounding. Try using a little subtractive EQ to clean up some sounds maybe.
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A good way to learn is to also listen to artists you like and try to find out EXACTLY what you like about that artist so much. Paying attention to vibe, arrangement, vocal additions, the sounds/instruments used with each other, drum groove, etc.