Following the guidelines given in this this blog: The best possible local navigation bar, I would like to propose the following changes to the top-level navigation to make it more reader-centric. The changes are itemized below, but it might be easier if you edit the MediaWiki:Wiki-navigation page and replace the contents with the code block at the bottom and then use the Preview feature to test it out (just don't accidentally save the changes).
Move "Timeline" from under History to the second level, rename to "Timelines", link it to the category, and put links to 10 of the timeline articles under it (Beastmen, Elves, Lizardmen etc)
Leave Heroes as it is? You can choose up to 10 here but it currently displays only the seven most popular (again, possibly incorrect)
Under Geography, replace these with links to articles and categories of large geographical area or importance. (Having two "Old World" links is confusing.)
Change Videogames to link to the category and remove the "more games" entry that links there now.
Leave Races as is, it's great.
Change "Want to help us?" to "Community" and link it to Special:Community which is designed for this purpose.
Remove the obsolete (yes?) Moderator Elections announcement.
Consider moving the "Join the Crusade!" blog page to the section of Special:Community designed for it.
Remove "Fill in the gaps" and "Write new articles" because these are covered by the Speical:Community page or the Add New Page button.
Consider moving Add Sources to Special:Community as well
Fix the broken links to the other wikis (done below)
Move the Forum links under the Community tab and rename it to "Old Forums"
This frees up an entire 7x10 navigation menu for additional links to important content as you see fit. Of course, feel free to substitute better or more appropriate pages or categories. I just picked ones that made sense to me.
* Warhammer World|The World
** category:History|Historical events
*** Age of Three Emperors
*** Grand Ball of Sigridschlosse
*** Night of a Thousand Arcane Duels
*** Night of the Black Waltz
*** Night of the Restless Dead
*** Plunder in the Jungle
*** Scandal of the Shroud
*** Winter of Woe
*** Year of Woe
*** Bretonnian Timeline|Bretonia
*** Dwarf Timeline|Dwarves
*** Annals of the Black Tower|Dark Elves
*** Book of Days|Elves
*** Greenskin Timeline|Greenskins
*** Imperial Timeline|Humans
*** Chronicles of the Lizardmen|Lizardmen
*** Skaven Timeline|Skaven
*** Vampire Timeline|Vampires
*** Wood Elf Timeline|Wood Elves
*** Chaos Wastes
*** category:Eastern Lands|Eastern Lands
*** category:New World|New World
*** category:Old World|Old World
*** category:Mystical Realms|Mystical Realms
*** #category# Age of Reckoning|Warhammer: Age of Reckoning
*** Warhammer: The End Times - Vermintide|Vermintide
*** Warhammer: Vermintide II|Vermintide II
*** Total War: Warhammer
*** Total War: Warhammer II
** #|Specialist Games
*** #category# Mordheim
*** #category# Dreadfleet
** #|Forces of Order
*** #category# The Empire|Empire
*** #category# Bretonnia|Bretonnia
*** #category# Dwarf|Dwarfs
*** #category# High Elves|High Elves
*** #category# Wood Elves|Wood Elves
*** #category# Lizardmen|Lizardmen
** Forces of Chaos
*** #category# Daemons|Daemons
*** #category# Warriors of Chaos|Hordes of Chaos
*** #category# Beastmen|Beastmen
*** #category# Skaven|Skaven
*** #category# Chaos Dwarf|Chaos Dwarfs
** #|Forces of Destruction
*** #category# Greenskins|Greenskins
*** #category# Dark Elves|Dark Elves
*** #category# Ogre Kingdoms|Ogre Kingdoms
** #|Forces of Death
*** #category# Vampire Counts|Vampire Counts
*** #category# Tomb Kings|Tomb Kings
** User Blog:Aresius King/First Crusade of the Hammer - Users assemble|Join the Crusade!
** #category# Sourceless|Add sources!
** Special:Forum|Old Forum
*** Board:Guidelines_and_Rules|Guidelines & Rules
*** Board:News_and_Announcements|News & Announcements
*** Board:Fun_and_Games|Fun & Games
** #|Our wikis
*** https://ageofsigmar.fandom.com/wiki/Special:WikiActivity|Age of Sigmar [ENG]
*** https://warhammerfantasy.fandom.com/es/wiki/Especial:WikiActivity|WH Fantasy [SPA]
*** https://ageofsigmar.fandom.com/es/wiki/Especial:WikiActivity|Age of Sigmar [SPA]
*** https://warhammer40k.fandom.com/es/wiki/Eswiki/Especial:WikiActivity|WH 40k [SPA]