During motion & Loosing FPS

@hopelinkaaa  Your dxdiag lists a number of Origin errors.  Try a clean uninstall/reinstall of Origin.  First, clear its cache, then uninstall it "the hard way" and reinstall.

https://help.ea.com/en-us/help/faq/clear-cache-to-fix-problems-with-your-games/

https://help.ea.com/en-us/help/origin/origin/manually-uninstalling-origin/

Be sure to disable Origin in-game as well, after you've reinstalled.  Hover over your username, select Application Settings, then Origin in-game, and disable the option.

That might not make a difference though.  If it doesn't, try switching among fullscreen, windowed fullscreen, and windowed modes to see whether it helps.

Among the many settings you changed in the Nvidia Control Panel, did you try enabling v-sync?  It can help with flickering and other graphics glitches, although it doesn't work in windowed mode.  (Sims 4 also has a v-sync setting, so try each one separately.)  And with Control Panel, be sure to create a profile for TS4_x64.exe, since I'm sure you're playing the standard version of the game, not the Legacy Edition.  It's best to restore defaults for that profile, then change one or two settings at a time.  Triple buffering is worth trying too.

If you're going to play in windowed mode, try manually limiting framerate to 60, the refresh rate of your monitor.  Again, there's an option within Sims 4's graphics settings, but Control Panel also now has a global fps limiter.  It does work in windowed mode too, at least usually.  You can manually set it to whatever you want.  Please restore the global settings to defaults as well before you go back to experimenting.

If nothing else helps, try playing while your computer isn't connected to the internet.  You can sign into Origin and put it into offline mode, then take your computer offline, as in, disable wifi and/or disconnect the ethernet cable.  This sometimes helps with low fps, although it's not necessarily going to do anything for the flickering.  It's still worth trying though.