Arhaus, like Restoration Hardware, and Pottery Barn have lots of stuff that looks good, looks fashionable, but when compared to other lines, not well made or comfortable. Look into (for about the same price) Taylor King (Portfolio Collection) where you can build a sectional pick your arm style, base options at no charge. $6300 for a 110" X 110 " sectional, 8 way hand tied, solid Maple frame. No down, down extra. Lot of fabrics to choose from for that price. Henredon, Fireside same options, grade C $7499 (Spring Blend Down seats, Down Backs, 8 way hand tied) 10-15 fabrics for that price. Flexsteel, $5000

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The first thing I would do is get white shades for your windows or sheers or drapes. Then I would get a more brighter colorful art work for over the fireplace and remove some of the things there. For the TV wall, I would get a longer slightly lower cabinet to sit the TV on. If you want to you could put an end table on the end of the couch after the cabinet is relocated. Get a lamp for the table and a matching floor lamp to replace the one you have. I don't know what room is behind the couch, but could you put a console table on the back side of the couch? Plants in the corner and on the console table would be nice. Also pick a color from the new art work and get two or three matching pillows for your sectional. Since you don't seem to have room for a coffee table, I would pull the ottoman out farther....the one that matches your couch. Just some ideas.

Here are some ideas. I would look for some wallpaper to line the backs of the cabinets as shown in a soft coral to brighten up the cabinets and give a nice background for collectables and some books. I found a open base swivel chair to lighten the look of the space. Found some pillows and a few stacking coffee tables for in front of the sofa. Put a pair of black textured vases on mantel beside TV for contrast and interest.