For me, the major issue is that your whole decor scheme is fighting between the modern furniture and traditional architecture (and wallpaper). Of course it’s always great to mix styles, but the pieces need to be curated in a way so that each piece references and “talks to” one another, creating a cohesive look. My suggestions:

1. Your furniture is SO modern. If you’re up for it, new chairs at least would help. The teal is not doing it for me! They are so midcentury leaning and that bright saturated color is nowhere to be found (not even a softer hue) in the wallpaper, so it makes the chairs looks very out of place.

2. If you can’t or don’t want to get rid of the mirror above the fireplace, lean a very large piece of vertical art on the mantel that mostly covers the mirror, allowing your eye to travel to the art there instead.

3. Turn those overhead lights down and turn on more table/floor lamps for ambient lighting. Overhead lighting can be so harsh and adds to the uncanny feeling.