You’re overthinking it. The hardest part is making sure you have a good backup. Get your files backed up, don’t forget about save games and whatnot that might be hiding in random folders. Take a disk image if you know how to do that.
Format the drive. Install an easy to use distro with gui stuff. Mint is great - feels windows-y. Ubuntu works - the drama is real but overblown for someone just starting out with Linux. Fedora desktop is the new Ubuntu. It just works. Gnome is different but many people like it a lot (myself included). It’s not hard to learn. Save the distro hopping and niche distros for later.
Install your nvidia drivers. (Look up Rpm fusion for fedora, mint has directions on their forums).
Install steam. Log in. Buy a game. Install game. See if everything behaves. It probably will. If it doesn’t - spend 15 minutes researching and trying the fix. If you can’t get it to work - just wipe the drive and try another distro. Generally newer distros will “fix” whatever issue you are having.
You can do all of this in an hour or two as a newbie and be playing games from the steam sale.