It would be better if you could change it left and right: that is, sit facing south and keep your back against the wall; Instead, open the window to the left (east) and the door to the south to the right, just like the purple gas from the east. The natural light on the left side of the desk conforms to the habit.
If you can't change rooms, you need to deal with the problem that the seat faces west: close the curtains, increase artificial lighting on the left side of the desk, and properly turn the right western wall to the left to avoid impetuousness.
I hope I can help you.