If it's reliably at nights, maybe fill your time with something a bit more positive like drawing, exercising (early on though, no later than 6pm), self care, coming on here, listening to/playing music, or some other hobby you really like.
Do you have trouble sleeping or nightmares or anything of the sort that could be worked out to make your nights a bit better?
Maybe try talking to your friends too. It doesn't have to be about your urges, just anything to take your mind off of cutting.