Keep it empty on purpose.
Pick one.
Most leftover space already has a job. If it is truly extra, these are the usual next steps.
Same rule in three places.
One verb per room. If unused for a season, it is storage.
An open Wednesday is a use. Protect the blank cell.
Clear the “maybe later” slice first.
Treat a sample room.
Leave it, fill it, or split it.
Desk
Shelf
Box
Plant
Work
Sleep
Empty.