rotated

I would skip the accent wall and work on the things that will make the room more lively, such as lamps, end tables additional seating, artwork. Maybe window coverings.

I think an accent wall is only called for if there is something architecturally significant to highlight. You have a lovely room, but I would not do an accent wall. Agree with graywings' suggestion to add other elements to the space to spark some more life: Artwork, decorative pillows, and perhaps even a rug on top of the carpet to add more pattern.