https://youtu.be/L1FLali0xLk We’ve done a lot of tutorials on processing audio and sound with Adobe Audition but many have asked how to do the same things in Audacity, which is, of course, free. The trick with Audacity is that it lacks certain features that can be critical for getting consistent results, namely, loudness processing and metering tools. But when you’re first starting, you may not yet have the budget for an Adobe Creative Cloud subscription. So if I were in that situation, here is how I would use Audacity to sort of accomplish the same thing (though not as consistently). Make your dialogue audio louder (without being too loud).
You can download and use Audacity for free - no strings attached, its open-source.