I’d use a little dynamic range compression* followed by a limiter to ensure consistent volume which did not exceed a threshold. Limiters stop the volume ever going above a threshold, free limiter plugins are available for Audacity …
e.g. steve’s limiter … Limiter [my choice]
and Missing features - Audacity Support
[* “Chris’s compressor” plugin for Audacity is superior to Audacity’s native compressor].