What do you do to complete/finish your ideas??

I have been playing dnd, forever DM, for just about 10 years now, but at the start of this year I wanted to do something homebrew and original. So I began as any normal lunatic and I began creating an entire world. My problem isnt coming up with ideas, but rather organizing them and figuring out how to piece them together and create a compelling story. I am a writer by nature and I love DMing and secret reveals, but I find myself kinda stuck with many strands and not a great way to complete them. I would love to just have a person that I could throw my ideas at and just get feedback that isnt AI, but all the people I know are currently playing in my campaign in this world and I dont wont to spoil any surprises or ruin any of the history before they discover it and learn it themselves. 

So to my fellow DM's and creators, what do you all do? Any tips or suggestions?