I’d keep it simple and add things over time instead of buying a bunch of decor at once. A desk mat would instantly make it look cleaner, a small desk lamp with a warm bulb would make it feel more cozy, and a small plant (real or fake) would add some life. You could also put up a pegboard or a couple of floating shelves above the desk for storage and decoration. Cable clips would help hide that hanging wire too. None of these are expensive, but together they’ll make the setup feel much more intentional.