some plants would be nice. could you put an eye hook in the ceiling and do a type of hanging Pothos in the corner? you have some beautiful light, I'd have a bunch of orchids and african violets! then just bring in few items this glass vase w/blossoms would look nice. you need something w/a little height. that's why I mentioned doing the hanging plant off to one side this one is almost identical to yours, but painted

How about mirroring the back of your china cabinet and lowering the chandelier to reflect in the mirrors and add more brilliance to your dining room? Consider flipping your living and dining rugs. You need a more classic one with that furniture and chandy. Since you apparently hope to replace the set eventually, you might try "ghost coating" it with gel stain. It doesn't require sanding and all that effort. Some don't think it is ideal for a long term solution, but I've seen it done very well and it will certainly update things. DIY videos on YT will help you decide.

If you have room for it, a buffet in which to store serving pieces, and on the top you can serve dessert and coffee. If no room for that, just hang the wall art. On top of the table, when you are not dining, a pretty flowering plant of some height or a plant with attractive foliage. What you have there now is too short and boring.

Not a professional, but love making a lovely home. Why not paint all the walls of the living room and/or the kitchen the new blue/green color? It really is a pretty neutral color that can pair and play nicely with many other colors and wood tones. A rug or art or new towels in the same green/blue color in kitchen could tie in nicely. I personally don't see anything wrong with your furnishings at present. They seem to go nicely together as is. Is there a particular reason you're wanting to replace or a particular look you are going for? That might help get you some more specific recommendations for new furnishings or ideas you hadn't yet considered. But painting and perhaps a new painted (same creamy white as cabinets) coffee table would go a long way to lightening and freshening up your space.