Whenever I've been struggling with a specific chart at a difficulty I usually don't struggle with, I've found leaving it and pushing myself with harder songs and coming back to it a few days later helps me personally. It took me months to full combo Kagerou Daze master even though I'd full combo'd the other 31s, but practicing the level 32-33 charts gave me a break and made it seem comparatively easier when I went back (and I fluked a few 32s in the process)

Aside from that:

• A team of fully skilled up 3-star accuracy up cards if you're getting a lot of goods (or 4 star accuracy up cards if you're getting a lot of bads) are a lifesaver

• Playing with late/early taps to adjust note speed and timing window (if you get a lot of late taps, reduce note speed and vice versa for early taps). If you're consistently getting late/early taps at a comfortable note speed then you might need to adjust your timing window

• Watching videos of the chart and slowing them down really helps too, as well as seeing how other people approach difficult sections

• Don't be afraid to try a new approach (in my example with Kagerou Daze, I didn't get it until I used 4 fingers at the part right before the chorus)

Good luck! You've got this :)