is the couch the only thing along the 23 ft. wall?

a photo of the room and wall would help determine...

Yes it is. It’s our second home so I don’t have a good picture unfortunately. The 23ft wall is technically dining and living room but it’s all on big space

so the other 11 feet is a dining room table and chairs using the same wall? this 72" x 24" is a fresh option. and reasonably priced. I would choose something that offers a scene... sounds like you need some natural light to make the room feel fresh...

https://www.greatbigcanvas.com/view/meandering-lake-i,2615327/#&gid=1&pid=2

The size of the wall is irrelevant. You size to the sofa, use 1/2-2/3 the width of it. 67" to 90" for one piece.

To cover that large an area it might be easier to use multiple pieces. Treat the dining area separately. All the pieces should be complementary, but not matchy matchy. Be sure to take your ceiling height into consideration. Don't feel you need to fill the entire 23' expanse.

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The wall can be approached with a wide variety of solutions.