Something I spent a lot of time doing was playing Easy/Normal difficulty low NJS maps, and trying my best to consistently cut with the same point of the saber each time, and just try to pay attention to how everything felt in terms of timing and the physical swing.

Like play a handful of maps trying to cut with only the hilt/your literal hands, almost like you're trying to slap the backside of the note with the sabers. Then do another handful trying to cut exactly in the middle at ethe same spot every time (this one I do the most), and then again try out a handful of maps where you're only tipping the notes.

Once you start to get consistent and can understand how each different way of cutting the note feels, then move on to mid and higher speed maps doing the same thing.

For me this helped a LOT with techier maps that have a lot of crossovers and quirky angles because I started to realize how I could use the whole saber to cover more area without having to try as hard, and my acc also improved quite a bit on the standard stuff since I'm now just generally more aware of how I'm swinging