A tidy kids' room doesn't happen by accident, it happens with systems that are easy for a child to actually follow. Start by sorting toys into labeled bins by category rather than one big toy box, so cleanup means matching, not searching. Keep frequently used items at a height your child can reach without help, and store seasonal or special-occasion toys higher up where they're easy for you to rotate in.
A dedicated storage bench or personalized toy box gives kids one clear home base for their favorite things, and doubles as extra seating in a small room. Use closet organizers with bins instead of a single rod when possible, since younger kids often find shelves easier to use than hangers.
Finally, get your child involved in the system. A room organized entirely by an adult rarely stays that way. Let your child help choose bins, labels, or the layout, and they're far more likely to help keep it that way.