Need wall inspiration

What about playing off of the square windows and doing a grid wall panelling treatment like this? https://www.frugalfamilytimes.com/2018/12/how-to-install-grid-paneling-for-character/

I would put up a nice big clock like one of these: https://amzn.to/3aVyShw

You could go with some art work long and thin between the windows, flanking the tv.

I think a grid board and batten based on the square windows would be awesome! Paint the wall a strong accent color such as one of the colors from the throw pillows or blanket. A deep sage green would also be gorgeous.

A quilt hung on a rod as colorful accent piece. Or a large vintage roll down map

A wall mural.

https://www.amazon.com/wall-murals/s?k=wall+murals

The windows look isolated from each other and disconnected with the rest of the wall. They also lack trim, which gives the area around them a very flat bland appearance.

I would suggest first adding millwork around the entire circumference of all windows to frame them. This would join them together, and would give the impression that there is one large window on the wall instead of four small ones. It would also add some needed dimension to the wall.

The room seems to lack color. From the picture you posted, presently the main contrast is the black tv, (against the beige wall) which is also the focal point of that side of the room. I would suggest that you mount two large black or dark brown floating shelves on either side of the tv/equal distance from the centre of the four windows.

On the shelves then add tall, 3D colorful objects, large dried arrangements, or fabric items. This will downplay the black tv, add texture to the wall, and life to the room.

Everything (except for the ceiling fan) in the room is floor-up.

To increase the balance in the space, and to help make the room feel more inviting, some of the contents need to be raised up, so that there are focal points at different levels around the room. Items of interest, artwork, plants, and additional small lamps can go on floating shelves in the corners, or on mantle style shelves.

https://www.google.com/url?sa=i&url=https%3A%2F%2Fwww.hgtv.com%2Fdesign%2Fdesign-blog%2Fdesign%2Ffloating-shelves-done-right&psig=AOvVaw36QRwH7sQxrtm6_9Do6Uae&ust=1614416564788000&source=images&cd=vfe&ved=2ahUKEwjW9ZbAmIfvAhXfAzQIHRv8B_0Qr4kDegUIARC0Ag

Your pic doesnt show a wall. Please post another pic so we can help you with some ideas

A gallery wall or floating shelves

What about an accent wall? OR wallpaper?

How about a large mirror?