I'm not finding any place where people share their keymap config (if that's the right way to refer to how you've configured which key has which actions bound to it), so here goes mine - and I hope to have feedback and to be inspired by yours, as well!
From some awesome inspiration, I updated the setup :-) thanks!
I moved the layer switcher to the left hand, and moved backspace to my thumb, so I don't strain my pinky so much.

I moved the arrows to right under my right hand... and added a button to make the switch to this gamer layer permanent. So basically, to go from layer 0 to layer 1 permanently, hold left thumb button, tap right thumb button. Tap left thumb button to switch back to layer 0.

And I added a num pad, also right under my right hand, where I'd expect it.

original:
I just got my first mech keyboard with fewer keys than a 'regular' keyboard, and set it up this way:

with the TG(1) switching to layer 2 for gaming/some extra symbols:

and the home row is modded to GASC like in https://precondition.github.io/home-row-mods#how-to-use-home-row-mods with 160ms tapping term.
I am mostly struggling to get used to this way of typing and I still spend a lot of time on finding symbols, or correcting extra or missed keystrokes. But, I'll try to update this when I have more experience.
Critique away!
Cool idea, here's mine ๐

Base layer: pretty boring except escape instead of caps. Highly recommend, who caps their locks these days
Layer one: cursor navigation for my left and num pad for my right.

Layer two: punctuation boogaloo (I'm a coder I use all of 'em)

Layer three is full of weird buttons like "F24" and "DM Rec Stop" that I use as hotkeys for specific programs.
It's probably highly sub-optimal, but I kinda like logical layouts :) plus its waaay easier to remember
oh wow, instant delivery - I'm totally copying that escape instead of caps, though I'd need to get myself mentally prepared for slamming ` 100x when I want to use escape.