Many home microphones are delivering with an artificial presence boost because “it’s more professional.” What that really does is make Essing more obvious (SSiSSter SSuzy SStopped SServing), and it makes normal mouth noises into tiny nuclear explosions. I’ve been known to make a custom equalizer filter just to suppress that boost. Does a world of good, but it has to be tuned for each microphone…
There’s also the bad joke of solving a lot of these problems by pulling a sock over the microphone.
https://forum.audacityteam.org/t/help-needed-with-sssibilance/50258/2
Koz