So if you know how to put eq presets in the programs folders you can go get mine try using them to repair the damage to the frequencys. Heres the post link to get them. https://forum.audacityteam.org/t/submit-your-eq-curves/14671/138 if you don’t know how to do that then just mess around with the eq settings but do it to a copy of the interview so you don’t lose what you have. You won’t be able to get it perfect but you can make it useful.
if you have an xp system you can try using the msagents voices to replace the messed up words if you knew what the word was. And you can still get the mash program from bellcraft.com but you will also need mad skills in misspelling words to get the voice engines to say them properly I’m able to do that but it’s 2 hours of work for a 3 minute conversation. Sadly msagents don’t really work on windows 7 or newer.
the best thing is if possible to redo the interview to get rid of the reed sounds of a bad duck impression.