arts and crafts sorta help. it helps to do something with your hands to keep them occupied. kinda like getting over a smoking habit, sorta.
cold water can also kinda, snap ya out of it, in my personal experience at least.
the thing about deeper wounds is that they dont exactly hurt as much for whatever reason. i can accidentally get a papercut in the webbing between my finger and thumb and that will make me squirm and writhe, but if i cut to fat on my wrists/thighs i barely feel it. i dont encourage self injury by any means, but if youre going to do it, you may as well try to go shallower. theres more pain receptors in the top layers of skin anyways. it also will minimize chances of long lasting damage.
the thing ive learned is that the road to self harm recovery always starts with damage control
just please try to avoid replacing cutting with a different self-destructive behavior, things will just get worse. or at least replace it with a self-destructive behavior less damaging than cutting. hope things get better op, im wishing you luck