The darn thing needs nothing on the side, including the tv crammed in a corner. Take a photo from the hearth end of the room. Relieve the cram, and find a better spot for the tv.

for starters, I think that it is way too long! Hopefully, the pro's can come around with more advice.

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Oof. That fireplace/surround/hearth is huge in proportion to the rest of the room and the height of your ceiling. And what's with the outlets in the middle of the wall? I would re-do the FP entirely with a surround that's at least a foot shorter on either side. Then you'll have room for built-ins on both sides with enough space for your TV.

Beings the space between your mantel and ceilings is relatively small you want to use décor that draws the eye upwards; more vertical pieces than horizontal. Think tall candlestick holders, plants, vases, tall sculptures, etc..

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What are the dimensions of the spaces above the fireplace?

Can the sectional go to the opposite wall next to the sliders? Then the TC could go to the wall across from the sliders.

Have the electrical outlet moved.

I'd try really hard to put the TV over a long (and low!) console on the blank wall to the left of the fireplace wall. Then the sectional could face the other way (or you might do better with a pair of couches and an end table in between). TV would be at much better viewing height. Then you can have the cable moved and all those crazy outlets lowered to normal height.

Do you sit in the black leather chairs?