"An everyday man gets thrown into the world of twilight thousands of years before the start of the plot. With immortality and incredible abilities. How will this man's presence change the outcome of the original story?" [ this is a slow-burn fanfiction; the MC is just trying to experience life and enjoy it, not to take over the world and rule from the shadows.] I do not own twilight or the characters of the twilight world, all that belongs to me are my own characters.
Mr. Uploader, honestly I think you have a great idea for what you want the story to be but no idea how to write it so you use A.I. If so then atleast do that properly. If I were you, I'd actually use something like sudowrite, or chatgpt project feature to divide the work in different chats and keep everything it check. Use something like a story bible to to ensure continuity flow. Upload season 1's timeline framework in another chat, use that to develop every chapter, before all this use a good prompt generator to actually create a good prompt for all these functions.