Advice on how to remove a buzzing sound

Hi I’m a VO newbie and have been recording an audiobook. Today at the end of a long day of recording, I noticed there is a buzzing underneath my audio. It wasn’t the day before and I haven’t changed my set up. I’m really hoping there might be a way to remove it because it’s a huge amount of time to re-record. Would love advice please?

https://manual.audacityteam.org/man/spectral_selection.html#example

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