I teach college, and something I see is that students who write too much sometimes pack too many ideas into each paragraph. Non-NTs seem to do this more than NTs, but NTs do it too, particularly if they're engineers.
A paragraph really should have only one topic. So once you know what a particular paragraph is about, stick to the subject. Then make sure that your paragraphs all line up to make your argument. Faulkner said that we must "murder our darlings," which many writers take to mean we have to cut stuff that would be really cool to include, but that detracts from the overall arc (or argument) of the piece.
Finally, your paragraphs should all line up to make a coherent argument, a bit like a mathematical theorem. The easiest way to cut is to compress your argument, but sometimes it's hard to see this until you've played with your paragraphs a bit.
Good luck!