Why can't I just make my track louder in Audacity?

A basic volume boost turns everything up together. If the peaks hit 0 dBFS, the file clips, dynamic range collapses, and harsh frequencies can become more obvious. That is different from mastering.

Neural Analog mastering uses limiting, loudness targeting, and tonal balance controls so the track can get louder without simply clipping. If the source is a compressed AI-generated MP3, restore it first with Audio Restoration, then master the restored file.