Some mods installed and treid already in safe-mode ?
Stuff like google-maps-replacement installed ?
Cleaned already the AppData folder ( scenery-* , dce , content-xml , rolling-cache ) ?
Is within the UserCfg file the new 3070 mentioned ?
May be good would be some screenshots where we see the menu and the taskmanager with cpu load ( per kernel diagramm ) and gpu load.
( and to be sure mention the game version and VR or Non-VR )