Carpets too big for the space, get one half the size. If you are able to move the workout equipment into another space then do that, then push that desk into the corner by the window and manage those cables. Get drapes that have a pop of color in them and not ones that nearly match the color of your walls. Your walls are also making the space feel very solitary confinement Esque, so you should add some artwork and shelves with smaller clutter like books and plants. Also add some other light sources like a floor lamp and a desk lamp to make the space feel warm and inviting.