What color are the cabinets ? I would take a door have it color matched and then have it cut 50-70% it would be the same undertones but much lighter. You might want to look at C2 Vancouver Day it is a very neutral gray I have it all through mymain living space .

I think there is too much brown in all your features (countertop, stools, sofa) that grey will look off in this space. I would try and find a more modern greige and i'd be okay with the sofa disappearing. We just inherited this problem in a house we just purchased - master bathroom shower is a very early 2000s brown with a matching vanity. And it is all very visible from the master bedroom so we needed to paint the bedroom and bath with a color that both updated but didn't fight with the bathroom. We chose SW Bungalow Beige and it looks really nice and modern. Both a light tan at the same time as feeling crisp and cool. And it ties in nicely with the bathroom. Even though every contemporary trend uses all grey, we had to ditch all our grey accessories, because they fight with the paint color too much. And we embraced all modern cream and tan sheets, etc. And somehow the room doesn't feel like an early 2000s yellow room.