First, discover your style. Write (one at a time) in top HOUZZ search box different styles. Examples include: transitional, casual, eclectic. Here is transitional to start with. https://www.houzz.com/photos/druid-hills-cottage-transitional-living-room-atlanta-phvw-vp~163182666 Get back to us when you have discovered your style! Also, note what colors and textures you like.

Define dated?

Get the sofa out of that corner as it is cramming the fireplace.

To me the furniture pieces are too many styles and bad layout Nothing really dated but a bit of fine tuning. I do not like slipcovers they always look sloppy to me . I would put the sofa facing the FP for sure it also then would face the TV too. The sofa is quite bulky so if changing furniture is in the budget I would look for somethin comfy but less bulky I think . A much alarger piece of art on that wall where you have it now in colors you love. Maybe a console table there but we need to see the whole space . For me in a nice suuny place can handle lots of color. BTW went to your idea books and can not get any feel for what you love . So maybe the plan to figure out what style you like would be helpful.

Some fine tuning around accessories could help too - think about having fewer and larger items (rather than lots of smaller items scattered around) - or you could consider grouping smaller items together to have more impact)

It is a nice space. I love the fireplace (although the mantel could use some styling)!
I think the main problem is the various pieces of furniture seem kinda random; there’s nothing connecting them. I would probably cover or replace the green chair, then get a nice rug to connect (physically and visually)the other pieces. I’ll bet some talented photoshopper here can help with that.

The stuff on the mantel is all small and random, so it’s looks cluttery, not impactful. There are a bunch of stories on Houzz with advice about decorating a mantel. Here’s one

https://www.houzz.com/magazine/11-tips-for-picture-perfect-mantel-styling-all-year-stsetivw-vs~6411089

I would keep the sofa, but slide it away from the fireplace. Otherwise, bright new throw pillows and maybe some new abstract artwork is all you need. And maybe something dramatic on the mantel.

It looks like all you might need is a large rug to help ground the space. See the images below for rugs we have used in our designs.

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I like BeverlyFLADeziner’s layout swapping the couch with the smaller chair. I also think it’s a wonderful room. Here’s a mock-up with a natural fiber rug, and some throw pillows to bring your existing colors around the room. I think some tall stems would be lovely on the mantel.