A calm room is rarely about buying more. It is usually about removing, softening, and slowing.
Clear one surface completely. Add one soft texture — a throw, a cushion, a rug. Lower the lighting and warm its colour. Give one beautiful object room to breathe instead of crowding it. And let there be a little empty space; emptiness is part of the composition.
A calmer room is a quieter kind of luxury, and almost free.