It's going to be labor-intensive and time-consuming, but you need to take all the books down and put them on the floor. Take them down and spread them in one area. Physically pick each book up, one by one. If the book inspires you, keep it. If not, it goes out. That's the standard by which you decide.
It's important to understand your ownership pattern because it is an expression of the values that guide your life. The question of what you want to own is actually the question of how you want to live your life.
I'd like to tidy up the entire planet. I would go anywhere if there were something that needs tidying.
About tidying up a toy box, you should let your kids experience the selection process by touching all of their toys. It's also important how they throw away their toys. They can earn a stronger sense of valuing things when they throw things away with respect and appreciation.
