Hi, I'm Rodrigo and I will help you.
I understand you want to normalize the volume on your music files.
You can do it using a third-party tool. MP3Gain is a free tool for that.
Download it at the link below, extract the files and open MP4GainGUI.exe
On the program, add the files or folders, select "Track Analysis" to analyze the files, and then "Track Gain" to apply the needed changes.
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If you don't want to normalize the volume on audio files, the loudness equalization options given by Q&A Assist above are the options for you.