It's the most important question for everybody else. The most important question for you is "what do I want to explore?" and everything here is a great answer to that.

I've optioned two screenplays and have a novel at a boutique in NY. You have more layout than any project I've ever worked on, and I worked with an MIT astrophysicist to lay out a plausible architecture for Alpha Centauri A/B because I needed day/night cycles and moon behavior. The trick is to funnel the part you find interesting into a part the reader finds interesting. Plot a story that exposes these aspects of your world as viewed through the eyes of memorable characters.

The world is figured out. There will be changes but they'll be dependent on what you need, not what you want. Now the trick is to determine who you want to explore it with.