Do you have sibilance or “Essing?” Do your “SS” words sound like they could drill wood? “SSister SSuzy SSells…”
If so, you may be able to correct that after Mastering. I use the Desibilator by Trebor.
https://forum.audacityteam.org/t/updated-de-clicker-and-new-de-esser-for-speech/34283/199
Try these settings first.
DeSibilator wants you to set the performance volume and if you apply it after Mastering, the performance volume is automatic. Getting rid of sibilance should not change the volume. It just gets rid of the ice-pick-in-the-ear sound.
Koz