No the wallpaper is great .. but all you need is .. two curtains .. choose their color from your wallpaper .. for example .. I see something like blue ..
so all that you need is two chiffon dark blue curtains at the windows to break the whiteness of the walls

and also a rug under the table .. in the same color of the curtain ..

Our kitchen has oak cabinets and we cannot replace the cabinets now. I read that to “work with” them teal/green/blues generally work well and minimize the orange tones. I ended up using Benjamin Moore Green Wave in my kitchen (and Opal Essence in the adjoining dining room and living room that get a little less light but also has oak furniture). I have been very happy with both colors. Not sure if they might have too much green to go with your backsplash but might be worth looking at.

A very light, soft color that picks up the gray/blue/green of your back splash would be beautiful, and give you the needed contrast to the cabinets.

You did such a good job. It updated your space by at least 25 years. Love the backsplash.