I think the reason you can't find a decent color is your lighting (and your choices. you're picking cool grays when you should be picking warm grays) but your lighting is very warm and yellow, so it alters the hue that you see. Given that you have north light, that brings in a cooler light, but not enough to really brighten up the room. as suggested, get some bulbs over 3500K. 4000K is natural day light. I'd start w/some of these Honestly? the red brick isn't all that. I'd paint it. white, black, gray, and bring in a large wood beam for the mantle. Paint the bookcases white too. I love this one. same floors as yours. do a matte black on the brick, paint the walls a nice, bight white (BM Simply White is neutral that leans just a tad warmer. I used it on my own walls. You can leave your ceilings as is, paint the beams, or paint the whole thing little diff as they kept the mortar joints a pale gray/white. you could choose to redo the shelving and do some built ins or, just paint them white and the brick either white or gray. ignore the fireplace, but these built ins are Ikea. It's an Ikea billy bookcase hack. super easy and looks great White brick, white walls, and bring in some cool furniture. I also love this mcm redo White brick, white walls, white ceiling. I don't like this color brick, just showing your the cabs on the sides. Romabio. look into Romabio (home depot has it) I'd do the masonry paint and not the lime wash. lime wash is too 'farm-y'. you want more mid century This stuff is super easy to use. Look it up and you'll find a ton of tutorials unless you want more of a country look: The masonry paint gives more of a solid coverage and can be tinted to any color

You could try dyebrick.com. It is brick/masonry stain. Try on a sample of similar color brick first, though; it only comes off with a powerwash! Assuming of course that you want to keep it....you could also remove the brick and replace with something different. We have done that before, it was very messy but not difficult. If you decide to do that, do it Before you move furniture into the room...

I like it the way it is, but either of the other options would look good, too. You have such little brick, the maintenance factor is not really an issue. Just make sure, if you do paint the brick, it is the right product.

Hoping you are doing a railing at the top of the steps…. in that case i would treat the wood…to establish a permanent color and then have the door match that color …since you seem to have other accents in the area of the same material…i would treat them as well….