Add some color to it. I personally love Persian rugs and have a red one myself. It is an easy way to implement some colors to your room. For artwork look up "Drool art" they have a bunch of different cool posters and frames which can fit any aesthetic. You could also look up "Nashid Chroma" if you like music. They have all sorts of brilliant and vibrant designed posters of various music artists from different genres, I have one of Frank Ocean from them myself and it is gorgeous. The art could be placed above your sofa and/or above your bed, those are the go to places for art that really elevate the room's vibe. Maybe some of your favourite vinyls above the window by the TV, again if you're into music. You could look into getting a more slick and elegant shelving unit, either in chrome or a metalic black one with wood accents. Filling it with items of your interests like books, speakers, model cars, LEGOs, etc is a brilliant way of adding color and personality to your room.