Friend's cat has passed, need audio clean up help

Hi all, a friend’s cat has recently died at the grand age of 18 yrs old. She has video of the cat purring, and would like help if possible cleaning up the audio to remove background noise. It is quite hard as the purr frequency seem similar to the background noise. I made what I thought was a difference with Davinci, but when I exported it, it sounded no different.
Some of you guys seem to know your way around audio stuff, so can anyone help please?

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