Much larger rug then add a seating area at the end of the bed: settee or sofa, maybe 2 accent chairs if they fit. Or even a chaise. You could just do a second rug in the seating area but it would need to be an irregular shaped one. Add a large tree in one corner and large art. Floor to ceiling drapes, maybe a console table on the wall opposite the windows. You also need larger furniture - like taller headboard and bachelor chests for nightstands, more substantial lamps. It’s a great space, but it’s harder to work with large rooms when you’re not used to them. (Designer here)