And just a bit of advice, when my uncle read my own book, the first part is posted on wattpad, he said it needed depth. Like you I alluded to a history of 100's of years, and you need to indicate that. Make reference to there history, make history for it, times dates, people places......I did not simply tell a story about a world or a time in history, I MADE the history and the world. For you, the world is already made, earth, the trick now is to create a history that people will believe or find minutely possible. THEN you got them hooked!