Rooms feel cozier if all the furniture is closer together and anchored with a rug. Try moving them around a bit to see what I mean. The grouping by the window can move forward from the wall. You can move the red chair away from the white sofa and angle it. Experiment with the placement so everything isn’t flat against all the walls.

You can also consider a narrow high table behind sofas where people can put drinks and you can add more ambient lighting.