A quick visualization of what I’m thinking.

https://lemmy.world/pictrs/image/8462f356-3be8-4dd0-85be-22e331c2a023.png)

Honestly I wouldn’t get more books, just split the ones you’ve got and a something fun to break them up.

If you are allowed, I’d repaint the wall. I think you could also add a large art print and a balance it with a cluster of framed pictures about the same size as the one you already have