You need to have a good speed, not too fast but you need to jump without huge efforts. Just let you fall like if you want to sit, turing your body on the side in order to put your hand on the snow. Then, when your hand is sliding on the snow, you’ll just have to use the snow to take your feet back to the slope by pushing on it with your hand. This trick is not hard, but you have to really engage you in it and to not hesitate. Please excuse me for my bad english, I’m french. Take care ! 🤘