Hard to suggest without seeing more of the space. Is there other trim in the room? If not, I would probably go with white, as now the fireplace looks very stark.

I was thinking white but then wondered if it wouldn’t look balanced since it’s only on one side. The trim is white (baseboards and door trim) and this is an accent wall (will be SW amazing grey but very similar to current color). The rest of the living room and hallway will eventually be painted oyster white (SW).