Interesting and thoughtful question.
I do actually have a "next game" in mind, although I still have a lot of work to do to finish FF&S before I consider touching that. As currently conceived, however, it would be a relatively main-stream game. (Another way of phrasing that would be "within Patreon guidelines.") After JohnCBB left FF&S, I found the writing quite challenging. Not all of the genres in it are really my own kink - a lot of them represented John's.
Whether I actually decide to dive into another game is an open question, however. By the time this project ends, it'll have consumed 5 years of evenings and weekends. Big decision as to whether I'm up to committing to a repeat of that. Of course, STDH might give me an opportunity to stretch FF&S into some genres that will not make it into the main story. We'll have to see. But even though I have the general outline for "Rich's Game Mark II," I'm far from certain I'll do it.
FYI, one of the competitors for "next game" is the idea of instead devoting myself to tutorials and sample code that other game makers could use, plus maybe some utilities that might be useful for people using Daz Studio. I
am a professional programmer, after all, so maybe I'll head in that direction.
So, I know that's an answer that isn't an answer. Maybe the TL;DR of it is "I don't know?"