Help with low RMS

I don’t speak ACX , bit I’d use rms-normalize* plug-in to to bring the RMS to -"20.#"dB,
then Audacity’s (soft) Limiter (No make-up-gain) to ensure all peaks are below -3.4dB

[* The “rms-normalize.ny” plug-in requires Audacity 2.1.3 or later].