One thing to keep in mind is that there weren't too many of the old-timers who could afford resonators, particularly as the Depression sunk in. But many of them did play Stellas, and they are famously loud guitars. Mine is the loudest wood guitar I own, and one of the loudest I've ever played or heard unamplified, if you try just a little bit to play it loud.
Also, I think that some of the perception of loudness can come from the attack and decay you put into your playing--a fast attack, or a snapped string, can create the impression of being even louder than it is. Similarly, I think a damped note, whether it's done with the left hand by lifting the finger or slide, or by pick stopping (or whatever it's called) with the right, draws the listener's attention much as a loudly played note would. So, think about how important those techniques are to the music and to creating texture in the music, but also to drawing the listener into the music, especially in a loud environment.
Also, I think that some of the perception of loudness can come from the attack and decay you put into your playing--a fast attack, or a snapped string, can create the impression of being even louder than it is. Similarly, I think a damped note, whether it's done with the left hand by lifting the finger or slide, or by pick stopping (or whatever it's called) with the right, draws the listener's attention much as a loudly played note would. So, think about how important those techniques are to the music and to creating texture in the music, but also to drawing the listener into the music, especially in a loud environment.