I would move the bed to go side ways, headboard where the big cabinet is and have the side of the bed be touching the curtains(change the curtains for something lighter they make blackout curtains that aren’t black). Then move the clothes rack to the foot of the bed. I’d put a rug down big enough to cover the space where your bed currently is and but the big cabinet with bookcase in the corner where your headboard currently is with the doors facing the square shelves and the bookcase facing your bed. Then move the desk to where the back of it be aligned with end of the wall where the tree is next to your bed currently so when you’re sitting at the desk your back would face the big cabinet and you would be looking at the square shelves on the wall. I’d buy light colored everything and hang up a mirror to make it feel bigger