You'll want to use Audacity's background noise removal tools on a small bit of audio at first, then expand it.

Audacity page showing how to install AI effects via OpenVINO plugins, with a download button and 7-step guide.

You can make your audio louder in Audacity's editing software by utilizing the Amplify and Normalize effects.

Audacity itself wasn't on the Microsoft Store, which was arguably part of the problem. That's now changed, with the people behind the software realising that the flood of fakes was getting ridiculous.