What should I do to keep my room clean and organized?

Make a bricks & boards bookshelf: images.google.com/search?tbm=isch&q=bricks+and+boards+bookshelves

Go to a drug store and get plastic shoe boxes. Get enough boxes to hold everything you own except clothes. You want these boxes to be stackable, so get all you need at one time because you might not find that brand again. Forty boxes will probably be enough, and you will be glad to have them.
www.homedepot.com/p/Sterilite-6-Qt-Storage-Box-in-White-and-Clear-Plastic-16428960/203120094

Now you're all set to make a hobby of arranging your stuff neatly.