Your weight is almost 100% on your rear foot. This will make it impossible to progress in the slalom course, so if that is your goal, I wouldn't think about anything else until fixing that.
In all honesty, I would try switching which foot is forward. This will feel terrible, but if video shows that it causes you to use your (new) front foot, then it may save you a LOT of frustration in the future to just bite the bullet now.
Barring that, or in addition to that, spend some time skiing with only your front foot. With you rear foot not even attached, you'll have to weight the front foot and learn to balance and steer with it.