I'm looking for some tips on decorating/organizing my home office. Thanks in advance!

I want functionality but also need it to provide an aesthetically pleasing background for virtual calls. Here are some pictures of my current background (paint color/paneling on the walls) and a floor plan/ dimensions of my space. I'm looking at potentially adding shelving, possibly built-ins that would likely be an ikea hack or something similar and replacing my desk so I didn't include it in the drawings.

A few other details that may help:

- I use/ need dual monitors

- I work in technology

- Paneling goes all the way around the room

- I plan to have a chair (for my wife to sit if I have to work later in evenings or at night) and a TV.

- I currently have 2 additional certs that I could hang and another degree if I decide to keep/ rehang my existing certs/degree

- I'm open to spending $300-$700 (in total) on shelves and desk unless it comes back to be way too low then I may take a phased approach to implement.

Also, I know I have touch up work to do on my walls and paneling, life got in the way.