Episode plot sections and character biographies are the two main groups of articles that need significant additional material. Those are quick wins.
There's also some work needed because of a reworking of the Navigation Menu, the menu at the top of each page, at Fandom's request. It's better because it now reflects the pages a typical wiki reader needs (about 95% if the traffic) rather than the needs of a wiki editor - but it's left the wiki without obvious routes to the pages about weapons, vehicles, locations, fan art, wiki policy documents - and probably more I can't remember off hand. That needs to be thought through along with the design of the main page (working in a sandbox of course) which is a bit sprawly and not very logical now - it has two video galleries for instance, and the slide shows are out of date etc.
There's a lot to do, and we're not precious about who does the major work like episode and character plot sections, main page design, and template reworking.
Apologies for removing the headings, I just assumed that the episode titles on the Dolores article would function like the "Young William" and "Man in Black" tabs on the Man in Black article. However, I don't believe those pages should be categorised under "Characters"; there's already a dedicated category for pages of that variety called "Tabview Character Plot".
If you check Category:Tabview Character Plot, you'll find all of the Man in Black's episode pages that are identical in nature to those of Dolores'. I believe Category:Characters should be reserved for articles based on the character's themselves, and placing the separate episode entries in said category would only result in unnecessary clutter.