How to amplify after noise removal w/out adding noise

Re: noise removal …
https://forum.audacityteam.org/t/experimenting-with-a-noisy-audio/16997/2

https://forum.audacityteam.org/t/audacity-noob-needs-help-with-filtering-noise/16185/3

Below is the equalization “curve” for a 300Hz -3000Hz band pass filter

You could try something a bit wider first, e.g. 200Hz - 5000Hz