We would need ISBNs, an editor, and a cover art designer. I don't know what other associated costs are involved when it comes to self-publishing, but that is something the team can all work toward finding out.

ISBN's are a Nice To Have but not a Need To Have when publishing through KDP. Amazon will assign you one that they own if you don't have your own. You won't be able to sell the book on other marketplaces with it - and things like Libraries won't shelf your book - but when ISBNs can range from Free With Hurdles (like in Canada) to around $100, it's an easy way to cut out some of that process by just using the assigned Amazon-ISBN.

There are a number of great and fairly cheap folks available for cover art comission on places like Fiverr. I think mine cost me $50 CAD or around that. You could look at the KDP templates and make your own cover too - but folks buying fiction on Amazon are very unlikely to snag a book with an AI art cover so if you go that route, use any of the amazing Fantasy/SciFi stock artists out there - it's usually a VERY cost-effective way to get great images for whatever you might need.

I've been noodling around with a concept for a second book of Prompts or maybe a slightly more focused workbook-style guided worldbuilding book that utilizes some of my new 500 prompts... and I've also been considering following @enjar's path of making a Choose Your Own Adventure style book and putting that out there. I think there's a small but decent community that still enjoys that style of fiction.

Nothing concrete yet, but of course, anything I put out will have a link back to HIVE as most of my ideas are first tested and drafted here!