This story is no where close to be over but here is some source material to get you started. There will be more in part 2 and yes the plot gets ALOT thinker.
Listed below are key document, names, and books as well as trusted researchers and Genealogist:
Books: The epic of Gilgamesh, The 7th planet by Gerald Clark, The Book of Enoch, The illusion of us by Mathew lacroix
Documents to research: The Enuma Elish, Cuniform tablets, Sumarian Tablets, The Sumarian Kings list, The Atrahasis
https://www.youtube.com/watch?v=r8bS-4UkvDQ&t=2860s