What are the big red scratch-outs? Furniture you aren't keeping? First step is the couch, second is the rug and third is the paint. Paint color should be based on fabrics and textiles (seating and rug) in the room. It can be custom blended, but the furniture is set in stone. When you shop for the rug, it should be 2-4 feet wider than the sofa. Slip it under the front 1/3 of the sofa and have it extend past the ends by 1-2 feet. You can use painter's tape on the floor to figure out the best size for your sofa and room. I'd replace the dining rug too, so the two are coordinated. In addition, push your TV credenza against the wall and put the TV on a swivel base to adjust for viewing.

I would get a light colored low key rug bigger than the one in the photo. Put the TV where the sofa is now, and the sofa opposite that with 2 end tables. A swivel chair for near the back wall, and maybe an accent guest chair on the side with the tv near the dining room. The arched entry to the dining room limits how "sleek and minimal'' you can be, but you certainly don't have to be old fashioned or cluttered. Everything sen below is from All Modern with other colors available

The current paint is fine honestly. I definitely like the idea of curtains or maybe some Roman shades. What’s bothering me most in this photo is the orange pillows. I think you need more texture and maybe stick with whites. I also think the coffee tables a bit small …

It looks like maybe you are not in the US? BM Edgecomb gray is a light warm gray that should look good with your tile and plays well with others if you have access to it.