First of all, what the hell is going on with your RAM configuration?
Your first stop should have been the protondb page for your game. Given that most other people report it as running out of the box, then the issue lies somewhere else.
Which proton versions have you tried? Since you have an Nvidia card, what is the driver revision? What desktop environment, and version of it are you using?
I hate to say it, but reinstalling your entire OS multiple times, without doing any troubleshooting, has been a waste of your time
I hate Elon just as much as the next guy, but pretending that this wasn’t a marvel of engineering is really disingenuous. People with intelligence beyond my comprehension made that a reality, and just because the company had his face on it, it doesn’t make it any less impressive