Wax the curb and your nose (of your board, not your's). Take speed and put all your weight on the nose when you are on the curb

I had the same problem and everyone said speed was the answer but what helped me was making sure that none of my foot touched the ledge but my nose because my heel was dragging behind

Speed and wax the ledge

Really put some speed into it and if you don’t have wax deodorant works just as good

Speed is needed

Come on an angle

Find a good angle, lean back a bit, and speed.