¿For Feng Shui Masters: home office desk ?

My home office desk is facing the south  wall, and I can only position myself in two ways: 1. I sit facing the wall which is in the south direction while the entry door is at my right side, on the west, with the window on the left side which is overlooking East.  Or I can be facing the window, looking towards east but the door is still behind me. Basically the window and the door face each other with me almost in the middle . How can I solve this? Any trips or tricks? 

Notes: I cannot change the position of the desk as it is pinned to the wall. There is a wardrobe pinned to the same wall, one of the corners being directed towards my chair. There is no one else in the house during my working hours. Thank you.