Record the room you have
Sketch the room on a plain sheet of paper, including doors, windows, and furniture that needs to stay. A rough drawing is enough to start; the measurements matter more than straight lines.
Measure the available wall lengths and the footprint of the main furniture. Add the space that doors and drawers need when open, rather than measuring only the tidy, closed version of the room.
Draw the everyday route
Think through a normal morning or evening in the room. Trace the route between the door, bed, clothing storage, and the place where toys are usually played with.
Mark any point where a basket, an open drawer, or an unfinished game interrupts that route. Keep this path clear in your sketch before trying to fit in another piece of furniture.
Give play a usable patch of floor
Choose a place where your child can spread out the activity they use most. A building game needs a different shape of space from sitting together with a book, so plan around the actual activity rather than a generic play-zone label.
Try the space with the toys before moving the heavy furniture. If the activity always spills into the main route, a nearby surface, a smaller selection, or a different position may work better.
Keep storage near its job
Place the things used together close to the place where they are used. Books beside a reading spot and a block bin beside the building space reduce the number of trips involved in getting started and putting things away.
Check how the storage opens and how items return to it. A unit may fit against the wall while its open drawer or pulled-out basket takes up the very space you planned for play.
Test one change at a time
Start by moving a lightweight container or changing what goes on one shelf. Keep a quick note of what improved and what became more awkward during the next few days.
Avoid shifting every category at once if that makes the room hard for your child to read. A familiar home for favorite things can make a new layout easier to learn.
Use the measurements before shopping
If something still does not fit, write down the exact space available and the job a new item would need to do. Include opening clearance and access, rather than relying on a product photograph to judge scale.
You may decide that a different container inside the existing shelf is enough. Keep the sketch as a working document and update it when the room changes, so the next adjustment starts with what you already know.