Beautifully done and beyond my technical reach but if I was to attempt it...
Start with basic video files exported as standalone video clips from a dedicated colour grading app like Resolve (which for me is the easiest way to accurately create & control the video colour and set the 'look')
Those graded clips would be the foundation of After Effects projects to which would be added a combination of layered photoshop files for the mist and painterly atmosphere effects. All comping, matting, titling & finishing in AE.
(May I also gently suggest in the name of readability that you delete your identical posts in other forums? If they receive replies, I can consolidate the three threads into the one that seems appropriate)