Is there room at that end of the dining room for a sideboard or buffet?

Instead of filling every wall, your room needs some texture. I'd add long patterned draperies and a rug. I'd also switch out your centerpiece for something a bit softer, like this

a collage wall or several prints.

You don't have room for a buffet, but a large canvas painting will make a statement on that wall. It won't matter that it isn't centered on the table.

I also think you should start with an area rug, and window treatments. You have art on the other wall, so I won't think you HAVE to put something on both. I would start with some textiles and then go from there. maybe offset floating shelves with decorative objects/vases/candle etc. would work if you still feel like it is empty.

Maybe a skinny console table instead of a buffet. Then the art and lighting. Yes to rug and curtains too.

i can't really tell from the pic but it looks like you have some sort of art on the other wall. So maybe a nice mirror. I love your dining room set do you mind if i ask the maker?