I glad you are ok,
If I am kinda near or passing someone I always call out "on your right" "on your left" not sure if this helps but can't hurt. NO way do you look uphill every time you make a turn nor should they.
I was practicing my failed 180's in the BEGINNER park, where I should be at my level. I was going down a triple set. I hit the 1st 2 straight on, planning a 180 for the 3rd jump. Well, I easy landed the first 2 and was doing my 180 when I biffed, then WHAM a trick skier nails me directly in the back as I'm lying on the ground.
My fault, no way. I'm sure he wasn't expecting me to wreck after easily doing the 1st 2 jumps, but he also had no idea I was throwing a 180 and he wasn't prepared for that.
I try to respectful of others as I learn, but, I wish the better riders would be more respectful and understanding of us newer riders.