Hi,
TLDR: There is now a tool that gives you list of articles to improve or create based on WikiProjects of English Wikipedia. For example, articles of top importance in WikiProject Mathematics that are missing or short in Azeri Wikipedia: https://whattodo.toolforge.org/?lang=az&topic=Mathematics&importance=Top

(I'm sorry for spamming your mailboxes, but I couldn't find a place to bring this up that would be more fitting.)

This tool basically gets the list of articles of a given wikiproject of a given importance and tells you which ones are missing are below 10K bytes in the given target language.

For example:
It is not perfect, for example the concept of importance and what articles belong to them is not perfect but it's better than nothing.

I personally find this useful in events and editathons where a newcomer asks "I'm interested in topic X what can I do?" and you can give them at least something to work on. Or for small or medium wikis to find gaps in their content in given topics.

Noting that there are more than 2,800 WikiProjects in English Wikipedia, the topics to pick are quite broad. From Olivia Roderigo [5] to Rome [6] to Soap Operas [7] to Trains [8]. Hope that'd be useful for you.

If anyone is feeling comfortable to help maintain or add features to it, please let me know. I wrote this in four or five hours, it's quite basic and more of a PoC of what it could become.

[1] https://whattodo.toolforge.org/?lang=nl&topic=Poland&importance=Top
[2] https://whattodo.toolforge.org/?lang=hu&topic=Physics&importance=Top
[3] https://hu.wikipedia.org/wiki/Molekulap%C3%A1lya
[4]: https://whattodo.toolforge.org/?lang=vi&topic=Computer+science&importance=Top
[5] https://whattodo.toolforge.org/?lang=fa&topic=Olivia+Rodrigo&importance=Top
[6] https://whattodo.toolforge.org/?lang=fa&topic=Rome&importance=Top
[7] https://whattodo.toolforge.org/?lang=fa&topic=Soap+Operas&importance=Top
[8] https://whattodo.toolforge.org/?lang=fa&topic=Trains&importance=Top

Best
--
Amir (he/him)