I did provide a hot-link to LevelSpeech2 in my post (above),
here it is explicitly … Improved "leveling" for speech - #27 by Trebor
Audacity’s Native Compressor tool will also make quiet sections louder if make-up gain is engaged, (but IMO Levelspeech2 does a better job) …
https://manual.audacityteam.org/man/compressor.html
There are plenty of examples showing EVP is audio pareidolia.
Digital audio processing, e.g. noise reduction, is particularly prone to accidentally creating voices which do not exist, e.g. Freesound - ''subject correct'' remix of 112295__timbre__love-you-to-bits-ansaphone-message-a-law.flac by Timbre
Here’s the science bit … https://youtu.be/MyQT78Bjt04?t=131
PS
I just remembered there is a plugin which is simpler to use than LevelSpeech2, which makes everything equally loud: called “Hyperexp” … Missing features - Audacity Support
It’s ideal if you want to listen to the noise floor, (but not much use for anything else).