Now what!?

Thanks to some much-appreciated support here on IH, great success on a few subreddits and some unexpected love on Twitter, in the first month of launch the-ux-mini-course.com has received over 1100 visitors, 60 email signups, and I've gotten over a dozen responses to the exit survey.

Maybe that's not a ton of traffic (I'm inexperienced at this marketing/sales thing)... but it's a whole lot for anything I've ever personally built and released.

I've spent zero dollars on promotion, operations, etc... and put in limited hustle.

I've got a lot of experience on the topic (UI/UX design & engineering), and it seems like there's definitely an audience for the material. I know the team that put together refactoringui.com had a lot of success creating a product in (almost) the same space. Theirs was more UI design and less UX design (though for sure the two overlap a whole lot).

The most obvious product is an info product (eBook or video course or ???).

But, now what? What's the next concrete step towards monetizing a product?

How could I incrementally build and release that content in a way that progressively delivers value?

I know better than to go off and build a huge big thing (product, service, or otherwise) without actually validating the market via paying customers, but I'm honestly not sure how to do that effectively in the case of an info product.

Do any of my fellow Indie Hackers have any experience they could speak from on this topic?

I know this was a bit wordy - that's probably a good indicator of my lack of knowledge :)

Thank you in advance!