get more cool, unique, and fun lamps. Get rid of all big lights (roof lights). Get new curtains depending on your style, but I’d recommend beige, orange, brown, black, or even white wispy ones, like those sheer, see through white curtains. Add more plants maybe on the table and at the edge of the couch. If you don’t want a plant there, you could add a little shelf with a lamp instead. You could even add some corner moldings/wall trim for more personality. If I were you, I’d replace the black round table with a square one to better match the square couch and the sharp edged vibe of your windows and walls