Video Imported in After Effects 2019 Low quality than the original video

Try updating or rolling back your graphics driver directly from the video card manufacturer’s site. If NVIDIA, do a clean installation of the latest Studio Driver (NOT the Game Driver).

Whenever I see green in an imported video, my first guess is a codec issue.  Looking at the Project Panel, it was shot with Apple's HEVC codec.  If you're on Windows, these are not included automatically.

https://helpx.adobe.com/uk/after-effects/kb/supported-file-formats.html

But according to that help page, you can buy the codec from Microsoft for $0.99