It is ironic when someone shouts "QUIET!"
Hold that image, as a distant cartoon, and let it dissipate.
Just for a day or two, try to speak less, and more softly. If you're already a quiet person, perhaps you can use the time to notice and appreciate that, about yourself. For the quick and too-loud among us, let's try to hear ourselves, and to raise the average of useful speech by letting go of some of the superfluous verbiage.
SandraDodd.com/quiet
photo by Charles Lagace,
of the inside of an iglu (inukitut for house)