No stupid questions - and welcome to KT!
While there are things you can do to make a One2 sound a bit deeper, it’s a lot of effort for little return IMO. It’s a fine keyboard, just not the easiest to mod.
In this form-factor, the two best sounding keyboards I have personal experience with are the Mode Envoy and TKC Portico68 Black Label. Both are more expensive than the One2, but you get a lot more control over the sound. (There are tons of other great options, I’m just familiar with those two.)
The One2 is around $110 on Amazon, again not bad but if you’re already investing that much in a peripheral… lots of “entry custom” keyboards will give you more control over the final product. For example;
The Portico68 is currently about $160 on thekey.company store website; it comes in a certain configuration with an FR4 plate and foam gasket pads, which can be further customized with aftermarket options. A plate made of POM or polycarb, for example, will go a long way to deepening the sound - this is true of pretty much any keyboard.
The Envoy is about $220 on Mode’s website depending on options - twice the price of the One2. I happen to think it sounds more than twice as good, regardless of options - but there are quite a few here, including some very soft 3D-printed mounting blocks.
General rule of thumb; softer material means deeper sound, mostly centered on the plate but really applies to the entire keyboard. (I’m talking plastic that’s relatively soft compared to metal; not so much the keyboards made of actual soft stuff like silicone.)
So - any given “entry custom” kit will give you easier access to the internals of the build for adding dampening material - but many of them will also have the option of polycarb plates or soft gaskets to help deepen and clean-up the sound.
The one I used to recommend isn’t made anymore; a plastic and silicone keyboard called the KBD67 Lite. One of those with some high-profile keycaps like MT3 in ABS sounds surprisingly deep. They made a decent number so they aren’t too hard to find; if deep sound is the main priority it might be worth finding a used one. Plate files are available and there are still some sites with extra parts.
Considering factors like aesthetics and typing quality, though, the Envoy is pretty killer. It’s not the deepest sounding entry keeb I’ve used, but it is the least effort I’ve ever put into a keyboard sounding as good as it does. Just note they don’t come with stabilizers; I recommend TX AP screw-ins.
An easy thing to fight hollowness for almost any keyboard is to add some kind of foam to absorb sound reflection in the case. Polyfill is a great option for large and small spaces alike as it is compressible and you can use more or less to preference.
Lubing switches (and stabs) can help with deepness, too - though these days it’s just as easy to buy some switches that are already tuned that way. Invokeys’ Black Sesame, for example - they are a decently pre-lubed switch with a nice deep sound. I’d recommend something like that for a beginner, as lubing by hand is pretty time consuming and it’s really easy to over-do. If you want to improve some switches you already have, though - that is the best way, and I’d recommend any one of the popular tutorial videos on the process.
I do have one whole 
