What do you want to accomplish? Make the room cozier? No to adding a rug on top of the carpet. I would choose 2 colors you like and use them for the accessories. Remove all the neutral pillows and throws and replace with some in colors you like. Put some lamps on the end tables so you don't have only overhead lighting.

I would just add some wall decorations -- photos, artwork, a decorative tapestry, wall shelves -- something. The room will look a lot more comfortable without the large flat expanse of walls unbroken by decor or shelves.

Jck910 thank you all for your suggestions..
My wish is to have more personality in the room, more colour I like the green idea.
Cosy is my goal with more interest.
Could anyone suggest a rendering of the space so I have a visual?

It's very cozy and nice. I could see plum/eggplant accents. Maybe some cool framed posters? Lamps def so you can ignore the overhead lamps.

This is an idea of what I like in my home, I think because there are no windows in the basement I get overwhelmed. To big of a wall above sectional? I’ll start with removing the recliner 😊

I don't mind the recliner. Depends on who you have down there. If it is for kids and they have friends over, why not keep it? Looks comfy.

I too think the recliner is OK - it looks like it belongs in a comfy, family rec-room. The only thing that I don't like about what you showed us is the blank walls.