Have you tried basking in the beauty of the Fireship website?
There are several courses and tutorials there, some available gratis. Perhaps Cloudron could approach Fireship with a view of creating a lesson or course for Cloudron. For example, how to package an application for Cloudron.
As an example, here is a Fireship lesson for Docker:
The lesson has a Youtube video, which you can watch here instead:
I think the market segment Fireship aims to serve has a lot of overlap with Cloudron's userbase.
Jeff Delaney, the founder of Fireship, also created (amongst many other amazing projects) another learning platform: CampusHippo
This is a site for nano-sized lessons on a topic. If a topic is not already present, for example Cloudron, you can create one:
or you can suggest one, and include how much one might be willing to pay for such a lesson.
Developers might discover Cloudron on platforms like Fireship and CampusHippo.
It looks like any of the Firebase tutorials can be used on Cloudron by replacing Firebase with NocoDB or Baserow for a fully self hosted setup.