Removing breath noises ... is there a plug in?

Did you get rejected by ACX? Did they say why? Typically, it’s not because of performance issues unless you’re really terrible.

Do you have Wet Mouth Noises, too?

https://forum.audacityteam.org/t/updated-de-clicker-and-new-de-esser-for-speech/34283/1

People who record for a while in a quiet room discover all sorts of problems. We live in an insanely noisy word that your head does a good job filtering out. The microphone doesn’t filter anything.

“Is that my refrigerator? I never noticed that before…”

Koz