It will help to see photos from various angles of this room, so that the room itself flows together appropriately.

A large built-in with shelving etc

At

Artemis_ma

such a large room, and everything is squished up close together! spread them out and give it some breathing room! did you used to live in a small home w/8' ceilings and a tiny living room? Because that's how you have this one set up. Take advantage of that space.

what's behind the sofa?

You really need a longer console. And I'd mount the tv to the wall.

you could do some art like this, but the tv should be only 2/3rd the size of the length of console.

'like this one

you could even do something like this for that entire wall. you wouldn't need art

with ceilings this tall, you need something like this. notice the console, the tv, and the art.

console, tv on wall, but notice how the sides are eaten up w/the tall plant (you need a tall plant in that corner) and a chair on the other side.

these others show how to decorate w/the tall ceilings.