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>Just to clarify, in an ideal space you believe the only thing black should be the couch (excluding the foot stool)?
I would strive to get a balance of dark and light furniture. Currently everything you have is black, and the easiest furniture to remove/replace to try and get that balance would be the footstool and the coffee/end tables. Of course, you can replace the sofa too, but I imagine that is harder to replace than the tables. Plus your coffee table is very big in comparison to the sofa, so I'm an advocate of just getting rid of it.
That being said, it's not just the colour black being the problem, I think you need more textures in your space. Currently, everything is heavy and black (light doesn't really pass through it), so even choosing furniture with visible legs or a glass top would change the feel of your space a lot.
Here's some quick links to some furniture ideas (take it with a grain of salt because I don't know what stores are available to your area/I don't know what you don't like, so I'm just using ikea as an example):
Tv stand (wood tone adds warmth to the room): https://www.ikea.com/ca/en/p/besta-tv-unit-with-doors-and-drawers-walnut-effect-light-gray-lappviken-stubbarp-walnut-effect-light-gray-s09298001/
Coffee table(s): (see through metal is light and airy, varied height is interesting, smaller to balance out the big heavy stuff in the room, round to balance out all the rectangles in the room) https://www.ikea.com/ca/en/p/kvistbro-storage-table-white-50322239/ and https://www.ikea.com/ca/en/p/kvistbro-storage-table-white-30349452/
Rug: (contrasts with the black sofa, adds subtle colour and pattern, choose whatever you like as long as the size is big enough for your room) https://www.ikea.com/ca/en/p/kollund-rug-flatwoven-handmade-gray-20374569/
Floor lamp: (provides a vertical separation between the living and study area, adds warmth to the room, metal is a different texture, round shape to balance out rectangles) https://www.ikea.com/ca/en/p/stockholm-2017-floor-lamp-chrome-plated-30345091/
Accent chair (place to the left of the tv in the corner, adds a fabric mesh texture and colour, visible legs so the furntiure doesn't look too heavy): https://www.ikea.com/ca/en/p/nolmyra-chair-birch-veneer-gray-10233532/
Side table: (pulls in some of the light wood colour from the chair, varies height from the desk and sofa) https://www.ikea.com/ca/en/p/lisabo-side-table-ash-veneer-10297656/
Accent light on tv stand: (adds another source of light = more cozy, adds a source of light for the accent chair, different texture, adds a different shape to the room) https://www.ikea.com/ca/en/p/fado-table-lamp-white-70096377/
Stools: (wood echos the tv stand's colour, natural texture) https://www.amazon.ca/Winsome-Wood-24-Inch-Barstool-Natural/dp/B000NPQFVK
Desk light: (another source of light, also functional) https://www.ikea.com/ca/en/p/nyfors-work-lamp-nickel-plated-white-00319692/
Bookcase (to place along the empty wall, breaks up the long wall, defines the tv area better, provides something vertical to look at from the kitchen, a place to display and store things. Obviously this is more expensive than everything else but the idea is to have something vertical and space defining, so it doesn't have to be a bookcase): https://www.ikea.com/ca/en/p/billy-oxberg-bookcase-white-s49017834/
I have written up why I chose each item for the room so you can understand the thinking behind it, and you can adapt as you need to to your taste/budget/size of the room. Also I didn't really go into the smaller stuff like pillows, throws, small decor pieces, curtains, plants. but if you study what's in the ikea pictures it should give you an idea what looks good together. I think small black pieces of decor scattered here and there should bring the whole room together. I hope this helped even a tiny bit