Are the cabinets wood? If so, refinishing them to a natural wood could look really beautiful with both color counters, and it would give you the freedom to play with color with the walls/decor.

You’re right on, about the backsplash. Changing that...when you are able...will make a huge difference. I would leave the cabs as is, until you can make that change, as the backsplash is intrinsic to the color scheme. Fortunately, you have plenty of natural light, so the few dark wood cabs do not “suck the light out of the room,” as is so often said on this forum.

Suggestion...get light rails for the base of the cabinets, to obscure the view of the under cab lights.

Absolutely what darbuka said. Start with the backsplash. What you have there now is too bossy and is the focal point.

Looking so nice.

I'd just paint the uppers at the side by wine fridge ..white to match the back wall of cabinets....this will make a difference and the other areas can remain white/dark in fact it is a space that can handle the two finishes. Replace backsplash if you can . Once you get some stools for seating that will help the appearance along that backside. Do you plan to use the seating area? So if minimal use, I'd still get stools.