If removing is not an option, I would paint it the same color as the wall color.

Remove all the decor it is all too crowded to the ceiling.

a much taller plant on the window side and a floor lamp on the interior corner?

Pull the chair out of the corner a bit.

Have you tried facing the sectional toward the fireplace, centered. ?

^Agree

I think you can work with what you have. IMO it's an effective feature wall in the room once the proper accessories are positioned.

The proportions on the wood surround were wonky to begin with. See sketch with a reduced size to see the difference it makes.

The surround look like it might be stained a dark blue, is that correct? I would paint the back wall to match. Right now the starkness of the wood surround is really fighting with the random windows. Once that conflict is minimized, the wall looks more cohesive.

The tv is on the other wall. It’s an espresso wood colour.

I assume that the sectional is faced the way it is because the tv is on the right wall? If not, I would listen to Lyn and try moving it in order to face the fireplace.

Lyn's idea of painting it the same color as the wall is perfect - it would make them blend into the wall instead of standing out like they currently do.

Team make that wall a dark feature wall!

How about applying a wood veneer on the mantel? It's a much softer look than the black.

Why would the sectional face the FP instead of the TV? That makes no sense. No one wants to view the TV looking over their shoulder.