Probably best to find a standard dev job and make a game on your own time as a passion project.
I watch twitch streamers who make games, and this seems to be the way to go. I can't really judge through a screen, but they seem happy and excited to work on their stuff, and not burnt out by their day job.
Oh, also non-compete clauses are going to mean if you work for AAA, you immediately can't make your own stuff anymore either
Depending on your jurisdiction, these can have various degrees of enforceability. A quick look at the wikipedia page for them tells me they are mostly void in California. Although I suppose no one wants to get into a legal battle they can avoid.
The guide won't work. Grub attempts to verify everything in /boot, even if it is encrypted, which is pointless for a desktop use case.
https://moonpiedumplings.github.io/playground/arch-secureboot/
Original guide I followed: https://wejn.org/2021/09/fixing-grub-verification-requested-nobody-cares/