Window seats would be one option.

This ideabook on color will help. You need to paint the recessed areas in a color that makes them look less deep and the wall between to recede. That should visually even out the issue. Include lined drapery that covers the windows and hangs floor to ceiling, matching the wall color, but possibly with a medium sized pattern. That will help with the visual balancing act. If you prefer shades, mount them so they cover the window frames when down, so the area appears to be one unified color. Then I'd look for a pretty banquette with a small glass coffee table to set your book, glasses, and coffee cup for a nice reading area. Could also be done with a pair of reading chairs and table between them. These are for style reference only, not color, as both style and color will depend on the paint selection and your current furniture style.
https://www.houzz.com/magazine/confident-color-when-to-use-cool-and-warm-hues-stsetivw-vs~286286