Thank you. Well, not so much on this topic speciically. I would advise to create a bit more elaborate call-for-help with some more background info, cross-post it to other relevant Lemmy communities, boost it on the Fediverse. And likely good to create a separate fedi (pleroma/mastodon/ etc.) toot with a bunch of hashtags in it and a link to the Lemmy post. Hashtags like: #art#artwork#graphics#design#UX
The question is whether the project should be forked into multiple separate projects at all. An alternative would be to have a generic “Directory Platform” and have modules to make it a Book Review platform, a Movie Database, or whatever-you-wanna-collect platform with another module. The modules would mostly be templates and data structures + user interface widgets to present them nicely.
This does not exist, as far as I know. I co-maintain the ActivityPub Application Watchlist which is AFAIK the most complete list of federated apps. If anyone knows about any app that should be on this list, I'd be glad to know :)