I cant leave the dessert area
pls can someone explain why the light says a sandstorm makes it impossible ??
...that means a sandstorm is there, and it's impassable, and you can't go that way yet. Should be pretty obvious.
You need to go somewhere else for now until you get the right protective equipment to be able to enter the desert.
If you're already in the desert area, your goal is in the north-east, down some stairs.