I guess, personally, my major piece of advice is that you probably will not be able to write everything you want to write within the same story without it losing a sense of coherency as a creative work. You’re either lucky or plain if you can manage to encompass the entirety of your ambitions into one linear plot. Start chunking your preferences into groups. Develop an internal set theory for your plot bunnies. Figure out what works well together and what doesn’t.

And as always, the most important piece of writing advice is that you actually have to start putting pen to paper/fingers to keys rather than infinitely graphing out your potential story. Your internal universe may be pristine but it matters naught if others can’t indulge in it. It’s like programming, premature optimization is a path to never making anything, the most important thing is that it runs and functions. Tinkering is a purely contextual activity. What use is designing the perfect jet engine if, once you’ve realized the parameters, you find yourself deciding that an elevator is a more appropriate mechanism to arrive at your destination?