I like your stone tile and counter choice. Agree to try to simplify. Honestly, in relation to everything else, the peninsula reads like a part of a ”before“ that the contractors forgot to demo. If you can, match the walnut stain, cut it down to be level with your other counters, and continue the counter material in the rest of the kitchen onto the peninsula. Good luck!
Edit to add: I’d consider squaring off the peninsula too for a more modern look.
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