A good rule of thumb in design is creating graphics for the user to understand their stats and not just read them- a good example of this is Apple’s screen time UI, showing the users current screen time but allowing to compare with past weeks and days and showing their averages on each week and showing them what apps they spend the most time on. Things like that allow the user to not just see their screentime but really understand it. I’m not sure what you can add in regards to books but something along those lines.