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Stocking Anarchy
Honestly Wikivoyage Wikiquote and Wikisource are all great.
Wikivoyage is overshadowed by the fact that many other websites are far more recognized than it when it comes to travel guides, and therefore it's probably bleeding money from the Wikimedia Foundation's donors. I'm pretty sure the names Travelocity, Expedia, and Orbitz ring a bell to you.
Wikiquote is pretty much redundant when there's a ton of other quote websites online that can do just as good of a job as it if you search up anything on Jewgle.
That, along with the outdated, very expendable, and barely updated Wikispecies (everything on Wikispecies is on Wikipedia with far greater detail and information), Wikinews whose existence is pointless in itself, and the aforementioned Wikiquote & Wikivoyage, which I feel can all be closed down without almost anyone batting a single eye or caring.
And yes, Wikisource is extremely useful already as-is, and should be kept along with Wikipedia, the Wikimedia Commons, Wiktionary, Wikidata, Wikifunctions, and the Wikimedia Incubator, but I don't think it should coexist with Wikiversity and Wikibooks especially given how they all target the exact same demographic and are all extremely similar to each other. That is, without it seeming like the Wikimedia Foundation is effectively throwing all of the non-profit money into a pit to keep those three websites running, while relentlessly begging for even more donated money every single year in those annoying pop-ups at the top of each Wikipedia article. Much like a bunch of kikes at a company's shareholders' meeting.
So therefore, I'd say the best option is to merge Wikiversity and Wikibooks into Wikisource. You're going to kill three birds with one stone in that single move while saving a shitload of money and retaining info from those three websites into a combined single gigantic entity that can be an endless repository for free referential text & educational resources online. That, as well as Wikisource possibly becoming a leading authority online on the matter instead of just second rate which it always has been.