The TV feels a bit high. Photos of the kitchen room would be helpful.

Yes, lower TV to make a visual "unit" with the credenza. Everything is up against the walls and the coffee table is not serving any purpose as none of the seats can reach it to make it useful for putting down a drink, magazine, remote, etc. Try a new arrangement by turning the rug and placing the sofa on the long side of it facing the TV. The coffee table should be 18" from the sofa to be useful. Then flank the sofa with the two chairs, facing each other from opposite ends of the coffee table. You can also angle the chairs toward the TV and use the side tables and lamps with them if they are close to an electrical outlet. You might pick an accent color for the TV wall, and match pillows to it. Otherwise, with the boxes and speakers, I wouldn't add other items to that wall. Try a piece of art on the wall opposite the windows and add a console table under it.