Notice which sounds travel: the refrigerator hum, the stair tread, the street, or a door that clicks. A soft surface or small adjustment can change the map.
Set up the feeling
Add a rug at a hard transition, felt to a door stop, or a curtain near a reflective wall. Do one change at a time so you know what helped.
Make it sustainable
A quieter home is often achieved through texture and placement rather than expensive equipment.