Nothing wrong with straight up asking your audience, how else would you know what we really want? Many game studios get told, but reject players wishes. You are out there taking notes.
Personally, for me to join patreon I'd like be able to participate in polls of events/scenarios that could be added to the game, seeing more of the art process and game creation process (how each character was created, what prompts were given to the artist, what were other iterations of the characters that weren't chosen, etc). Basically stuff I wouldn't be able to get otherwise, even after the game launched... the bts, helping shape the game, the how it's done...