Sadly I do not have an income so I cannot funnel money towards you. But, here's the result of me thinking about your Patreon for a while:
One thing I've seen patreons do is have patrons get access to stuff first - donno if this counts as "holding stuff back" if you're only doing it for, say, a day. So like, you could maybe offer up beta reader positions? (Or gamma reader, maybe :P) Or just post stuff to Patreon a bit before anywhere else, to give patrons an early sneak peek.
The "chat with me" stuff you have is another thing that seems common, but I usually see it in the form of "this level of patron gets access to a once-a-month Q/A group chat" or "this level of patron gets access to a weekly livestream of me as I work" rather than one-on-one stuff which could theoretically get pretty time consuming?
Another common thing I see only applies to those who keep a regular update schedule (which you don't), which is like, "in addition to the monday and friday updates, I'll also post an update on wednesdays!" or "i'll write another thousand words per week" or the like. I'm not sure how to translate that to your irregular update schedule - if your writing habits involve anything frequent or regular, even just like, "sit down and try to write for an hour", you could maybe promise to do that more often if a certain amount per month is achieved?
The last thing I can think of that I've seen done is giving patrons access to like, behind-the-scenes stuff like early drafts, concept work, commentary, scraps/snippets, that sort of thing. So if you have anything along those lines that you're okay with people seeing, you could maybe do that. If you didn't have the worldbuilding threads here, access to that sort of thing would be good. Maybe some level grants access to spoilers-on-request?