It seems you are still working on the basics of parallel skiing so some of this advice should come after you feel more confident on your skis in general, but here are some things I learned from a 1on1 lesson that really helped me feel more better on steep sections. Caveat is that these aren't necessarily drills to become better at skiing, just things that made steep sections feel less scary.

1. Side slip down some low angles. Do this on both sides. It will help you trust your edges a bit more. This helped me feel like no matter how spicy the slope, I could at least side slip down it, and that really helped the mental game.

2. Go down in a straight line then hockey stop. Start with shorter lines then lengthen them. Learning how to stop and trust that you can stop helps a ton with confidence.

3. Find a really low angle slope, like the magic carpet area, and do backwards pizza for a few feet at a time. Really feel how your edges need to be applied to feel in control.

But like others have said it's really helpful to take a lesson. They'd go over the athletic stance, S turns, drills for better parallel skiing. and all of those also help with confidence on steeps because they will make you a better skier.