Several questions we need answered so we can help. What is the main purpose for this room? How many people use the room daily and how many guests do you want to accommodate? May we have more pictures of the room and a hand drawn sketch of the room with measurements of each wall, doors, openings, windows and fireplace? That will make it possible for us to give you accurate suggestions. Thanks in advance.

Of the wall art you have the one that appeals to me is the Audubon Louisiana Heron framed print. Good colors for the room. I'd give it the place of honor over the mantel. The wall of the fireplace could take an accent color for a Heron backdrop. Something on the idea of what is behind the macrame.

This piece is from etsy. You can hang it to cover the t v when not in use.

It works with the Audubon colors .

https://www.etsy.com/listing/1688078027/macrame-wall-hanging-tapestry-hanging?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=tv+cover&ref=sr_gallery-1-18&pro=1&content_source=f5526a4ccea91f2710a7594be6d25c70306b259f%253A1688078027&organic_search_click=1

Answer to your question: what to put under the TV? Recommend that you find another antique piece that will fit in with the other beautiful furniture that you already have. Then lower the TV and hopefully you have one that has a screensaver that looks like a picture when not in use for viewing.

Birch Lane sells furniture that you may like and seems as if they will go well with the other furniture in the room. Not knowing the length of the buffet table I ask; Will it fit under the TV or is it too long? If will fit under the TV than you could purchase a console table and put it where the buffet table is now. Hope this helps.

Here is a picture of a Birch Lane 72 inch console table in Cherry. If this one does not work for you perhaps Birch Lane has something else that you would like.

Here is the link: https://www.birchlane.com/furniture/pdp/balsam-72-console-table-b000707292.html?piid=1071816941

There is also www.LittConceptHouse.com

And last but not least: An Ethan Allen sideboard or buffet table sold at https://www.chairish.com/product/15106636/1960s-statton-furniture-traditional-queen-anne-oxford-mahogany-3-drawer-sideboard-or-buffet