I actually don't know.
If I become famous probably I will be finally having trust and confidence in myself that I now have achievement. I will try my best to keep up with the fans to prove that you are never too popular to interact, or acknowledge people. If I got insanely famous though, I need to be careful of my real identity.
What will I do? Maybe I will try to create a platform primarily for hosting original fictions and social media for writers. Not that I dislike fanfictions, but I think they already have their own specific platforms and are everywhere.
I want it to be less restricting in the term of contents, but guidelines must be strictly enforced (so plagiarists, advertisers, and people creating illegal contents wouldn't survive a day). Ideally, it's also should facilitate effective social and communication platform between writer to readers, fellow writers and fellow readers.
Maybe it's a petty "revenge" from my own disappointment on various hosting site like Wattpad, Tapas, Webnovel, and such; but no one can stop me if I'm famous and rich.
If I got some riches from my fame, I would invest it and make sure I have a security net if anything goes wrong.