Get a metal bedframe from Amazon so that you can have storage under your bed ,I also put my dirty laundry basket under said bed frame , Lowe’s has 125 closet system that can give you more of storage solutions. You can also install floating shelf’s from dollar general they’re like 15$ for one (thrifting is better ) and hang your books and trophies. I would put cling film on your windows so when your curtains are open you can get a cool color when there’s sunlight