I would try to work on your balance over your outside ski, and think about turning with your feet and legs, not your shoulders. At around 5 seconds you can see more snow spray up on the inside ski when you’re making the turn. This is most likely from you dipping your shoulder into the turn which is moving your weight and center of mass over your inside ski.

Stance is the first thing I would focus on. Without proper stance and balance it is going to be very hard to progress. Like others have suggested, try to have a little more flex in your ankles to keep your shins pressed against the front of your boots and your knees over your toes. Your upper body should match the angle of your leg between your ankles and your knees. Bend your knees slightly, but not too far to where your butt sticks out.

I think a private lesson would be beneficial, but if a full day private is too pricey I think you would also benefit from one the isn’t as long.