You might also consider enable zram (aka download more ram that actually work) if you do a lot of compiling from the aur, my 16gb laptop crash when trying to compile Cosmic DE.
I just bought a laptop yesterday (NVD GPU+AMD APU), and graphics hybrid work just fine for me, maybe AMD is that good that it make NVD GPU work on Linux.
My CPU got up to 93C and GPU got to 85C when use ultra settings and unlock framerate, I'm might look into undervolting in the future but I might have some problems because I never done that in Linux.
LOL