The top two are where we're at (the couch doesn't look green in photos because of lighting I assume) and the bottom is what I hoped for.

DEEP BREATH! Luckily a color issue is only that. Have you looked into slip covers?

Assuming you can't return the sofa... unless you can then I would and keep looking for something you both like!
if not,
1 Change the grey blinds to white curtains on a black rod.

2. Add a light rug to the floor to lighten things a bit.
3. Add a coffee table with wood, black or glass accents.
4. Buy some art for above the sofa that you love with either some color accent or something abstract.
5. Pull the colors from artwork to add as pillows and throws.

Don't give up, you just need to adjust the picture a bit and still try to get the overall lightness and darkness contrast in balance.
Good luck!

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I definitely agree with previous suggestions. Absolutely get rid of the gray blinds. You need some white window treatments here. I love the idea of a very large rug, the black and white one modpod posted is great. You have 3 different grays going on and these steps will eliminate the competition they are having.

Can you exchange the couch for another color or return it? It's not a good idea to spend more money redecorating around something you hate.

Room just has to accessorized, to offset the couch’s shade comparison to the other greys. Once you add a rug, off white linen like drapes (try Ikea), art and tables, I’m sure you will be happier. Fine tune your selections by searching for room inspirations and then start to narrow down pieces, so you have a direction and less likely to end up with things you aren't happy with. I could see a light, yet warm and earthy feel.

My first question is: Does your partner feel it is comfortable? Because if not, and you ended up with a very disappointing looking sofa whose only reason for being in the house turns out to be a failure, then you really should consider replacing it ASAP. If you can’t return it, sell it, even at a drastic loss.

But if it is comfortable to your partner, then send a picture of the sofa to a local upholsterer and ask for price quote on re-upholstering it or slipcovering it In a lighter toned fabric you like. If the quoted price is out of your budget, then — challenging as this will be — look to see of there is any possibility you can find pre-made slipcovers that are actually nice. Most of them are not. But it is worth looking an hour on the internet to find out for yourself.

But even if you find pre-made covers you think solve the problem, think about whether selling the sofa and replacing it might still be cheaper.

Everything you do to remediate this problem will cost you money — replacing drapes, buying rugs, artwork, coffee tables, pillows, throws — so take a hard look at whether if in the end it is cheaper to take a loss on selling the sofa and getting a new light colored one.

I think the sofa is really good looking. Get an area rug to break up the gray on gray. Once that is done, get a big print or other piece of art for behind the sofa.

What is the measurement of the sofa and the room, so we can give rug dimension suggestions? Don't do anything drastic.

https://www.slipcovershop.com

I agree that you need a rug that brings out white. Because of your black cat, you might need some sort of tweed that will hide cat hairs. Then, black and white photographs or other art behind the sofa. If it were my space, I'd add red or teal to the color scheme, but that might not be what you have in mind.

You have nothing else in the room, no lighting, no rug, no artwork etc….nothing. As others have said, a large rug will change the space considerably (modpods photo with the black and white rug is fabulous!). You need some beautiful lamps, a ceiling fixture along with coffee table, end table and artwork over the sofa. The space is stark and empty and so impossible to make a judgement simply based on the few things in the room. Lighting is a huge mood setter in a space, and you have none, which exacerbates the cold and empty feeling. A gorgeous rug, lamps, chandelier, tables and artwork will go a long way in completing the look and make it feel like home. You’re just getting started….don’t panic yet!

A white or colorful rug, colorful artwork, and white blinds would transform this room into "modern, yet comfortable". I have a cream couch and honestly, would rather have gotten a darker color. No red wine allowed in the room. That's no way to live, lol.

IMO the sofa is too big for the space.

If it were me, and I got something I really hated, I would bite the bullet and either exchange it or sell it. Then start over.

A good sofa is going to last for YEARS. Personally, I wouldn't want a thorn in my side to irritate me year in and year out until the mid 2030's.

Slipcovers are expensive.

The room needs more casual lighting.... at least one floor lamp and one table-top.

Piping is a bit lighter grey? I'd bring contrasts into the rug.

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If there are different shades of grey already, don't add more except in the tiny amounts [in accessories], but try your others of black, white, cream.

Is there any item you'll need that we can post ideas for?

Someone might suggest trying cool temperature LEDs...

Here's dark grey - purple items, instead of brown throw ?

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Try changing the temperatures of the lights puts a warm light that I did not influence, in the colors of your decorations.

Talk to a lighting expert, set it up.

give you an idea of what it could look like by just adding a rug.

With Melissa R's throw and rug.

You might look into Flor carpet tiles, which would work well with the modern look you’ve got going on and come in some nice variegated patterns that would help combine the grays.

flor.com

I second the question: is the sofa comfortable? If it isn’t, your best investment would be to sell it and try again. I might lose the contrast light piping trim if you do this, it clashes a bit with the overall aesthetic.

IMO get a rug and include in that rug an accent color you like . So a white, black and yellow rug for instance.

With moody blue rug, all your grey might work, and with striking lighting, and art ?

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Yes, dull muted. Maybe with accent wall painted a liked color.

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40" W

Visualizing some of the aforementioned ideas.

something tells me that opening those blinds would automatically make that room look better. if you need privacy, consider replacing them with sheers, white drapes, or both. (if you want to keep the blinds for occasional use, consider installing curtain panels at the left and right to trim this out. plus, it'll hide the blinds when they're open.)

once you start to get rugs, art, accessories, this place will start to come together. get some big plants!

see if you can find a better place for the pet food, or some kind of nice looking furniture that would partly conceal it. this could double as a side table for the couch. imagine something like this below, but a more modern design. this might need to be custom. I don't think it would even need a handle for the door.