Some Origin games have authorization limit. Try download the de-authorize tool.
http://activate.ea.com/deauthorize/deauthtool/DeAuthManagementTool.exe
https://activate.ea.com/deauthorize/
Can you use Pascal's RTGI shader with vkBasalt now? I recalled a lot of shaders didn't work with vkBasalt so I stick with Reshade.
ProtonUp-Qt - Mainly to manage custom Proton/DXVK/Wine for Steam/Lutris
Not so much. I'm all on board to relive the experience of 1st time playing Skyrim but I'm not in rush. I don't really care if I play it few months or years later.
IIRC, FSR2 have more performance overhead compare to FSR1, if that overhead hit your CPU limit then you'll get lower performance compare to FSR1.
What is your system spec?
Someone probably gained access to your Steam Login Token and changed everything.
Maybe it something you installed recently, or clicked recently in Discord or phishing website.
https://help.steampowered.com/en/faqs/view/0a94-f308-34a5-1988