to the fireplace, center the furniture to it as well. a bit bigger rug (i know it might not be affordable), might help define the space
Side note I would flip the couch and the chairs and angle the chairs, use that bench as your coffee table
or
face the sofa to the fireplace and the chairs flanking it, seems to me you need to fill a little of the void space up here. this will also help fool the eye.
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