.... My suggestions regarding "improving" the tone or volume start and end with string choices. I don't know what you've tried, but there are a zillion and a half choices out there....
This may be apropos:
A friend of mine recently started up a new YouTube channel titled, "I Can Fix That." He asked me if he could film a short video at my shop regarding string choices. He brought over his Guild. Per his request, I tried to keep the information really high-level, more general knowledge stuff, devoid of any particulars. But he did have a personal string preference, so we used his choice for the short section on "how to re-string a guitar." You might find some of this helpful:
When looking for more volume and/or a different tone, let's make some assumptions:
1. Your guitar is structurally sound (no loose bracing, no serious damage)
2. Your bridge has sufficient mass to drive the top (it wasn't simply "sized" to accommodate an inaccurate neck set, nor has it been (overly) shaved down to avoid a neck reset)
3. You have optimal break angle for your guitar (where the saddle is tall enough and/or the entrance point of the strings into the bridge is close enough to the saddle to create an acute enough angle for the strings to pass on the maximum amount of their kinetic energy)
If you are hoping for more volume, increase the string tension. In other words, if you are using Silk & Steel, switch to a set of Light Gauge strings. If you are using Light Gauge strings, switch to a set of Medium Gauge strings, etc.
If you are wanting a different tone, (assuming your hearing is still intact) your ears will recognize the difference between brass and bronze, so experiment to find the sound combination (metal string wound alloy with your guitar's woods) you currently prefer.
If any of points 1 through 3 are suspect, you may want to start there, first.