Welcome! I used to be a regular on this board a long time ago, and I only recently came back for advice. I wanted to welcome you to the boards! Typically you would post all your pictures, wants, needs in the same thread. There are some very talented people here, I'm sure they will be happy to help you!

Try this......move the ottoman where your coffee table is now just to see if a darker plane will give you the "anchorage" you're looking for. If that does the trick then you can either purchase a new, dark coffee table or paint the base of your existing one. I think adding an area rug will make the space seem too closed in. I like all your colors.

The first thing I would do is get thet TV off the FPit is hung way too high and it looks like a heatilator type FP so the ventting of it will ruin the TV. Try thinking of the FP as one focal point and the TV either wall monted on an articulating arm beside the TV or that TV on the wall beside the kitchen doorway and rearrange the furniture For us a to scale floor plan is always helpful showing all the measurements , windows doorways etc The to scale plan is a great addition to the pics it helps getting a feel for the space . For sure at least give us the measurements of the room

If we go with the rug, curtains are next. What color? I have already brought home a light stone which my daughter said was not enough contrast to the sofa. Khaki didn’t look great behind the couch. Off white was very plain. I am avoiding gold after living and decorating through the 70’s and 80’s and early 90’s. The walls are a very light tan - Valspar Desert Fortress. And not being repainted. This is why I don’t make major changes very often. Yes, my house and furniture are not a cookie cutter look.