Great advice from klfische. Though you can certainly pick art from more than one artist! You should also pick art you like, not only to fill wall space... And use it to draw your attention to a space that you want to draw attention to. For example, that fireplace is a great focal point so aim to choose art (if you decide on art) that complements it, rather than competes with it.

Try taking away the side tables and place the chair closer to the couch. Does the fireplace look better with more restrained decorating? Usually when something highlights natural materials - as your fireplace does - less is better. If it does, try adding a more interesting rug as the art piece in the room. It should also be larger as right now, the chair is floating rather than anchored with the couch.

Your home has a neutral base to work from which makes it a lot easier.

Try bringing the chair closer to the couch even with the tables on either side of the FP. I like the idea of a larger statement rug with more neutral art. But as Azlee said, be sure the art is something you love, not just a piece of decor. Be on the look out for rugs and art and whichever you find first, make that the statement piece and choose the other to work with it.

I agree with the art work suggestion. If that's what you do, make sure not to hang them too high above the tables. Keep the table top decor very simple. This link is one that might be helpful for hanging art.

https://www.kylieminteriors.ca/the-right-height-to-hang-artwork-and-mirrors-tips-and-ideas/

For now I would put the front legs of the chair on the rug. If that's too tight, a larger rug would be good.

I like your two side tables. You just need more vertical and colorful elements. Doesn't need to be bright color if that's not your thing. A smoky blue gray or green gray would look good with your chairs, paint and fireplace. Cranberry or rust would also work if you like brighter colors.

Chunky lamps or a ceramic vase would look great, along with some art. I'd advise against generic pieces. Keep your eye out at second hand stores, garages, family attics ; ), and Craigslist for better pieces that aren't mass produced.

Is it in the budget to replace or reupholster your kitchen island chairs? I don't think the cream is doing much for the decor against the white cabinets.

Great bones, you just need some tweaking and layering.

It may just be the camera angle, but center your rug with the entire fireplace and the coffee table with the firebox. Then bring the sofa 12-18" from the coffee table. I agree that art would be the solution. Stay out of the big box decor stores though. Shop online or at a local university art department. You might find a nearby town that has an arts community where you could support local people. Keep the art no wider than 75% of the tables/ widths.

Those side tables are a little on the short side, but if that's what you're going to do then I would put two very large complimentary art pieces over each one hanging vertically to fill that open wall space above them. You have too many small pieces on those tables, that's why they don't look good. You need something bigger to match the scale of the fireplace.

A couple of rules for those without the designer gene. 1) If there are a hundred of them at Hobby Lobby, leave them right there. You don't need them in your house. 2) One large unique/beautiful/interesting item is worth 100 little tchotchkes.