This is all perfectly understandable. I definitely got the vibe that they didn't even know what to do with Morai Heg in 8th Edition, because they kept floundering around with her and I never even knew much of what she was like because it seemed like her domain was just straight up taken by both Ereth Khial and Lileath. You'd probably do something different with her then. I think this is one of those cases where canon sources dry up on insights for how the quest would be doing it.
Many of the gods in the Elven pantheon are represented by some group that venerate them greatly. War Dancers and Shadow Warriors for Loec. Saphery and the White Tower for Hoeth. Yvresse for Ladrielle. Kurnous being represented by the Wild Riders, the Asrai, Chrace and Ellyrion. Lileath is represented by her blessing to High Magic and all the artifacts she keeps chucking onto the Elves. Asuryan represented by the Asur and the Phoenix Guard/Phoenix King. Isha represented by Avelorn/Everqueen/Ariel/the Handmaidens/Sisters of the Thorn and tons of others. Vaul is represented by Caledor and his Priest Smiths. Mathlann by Cothique, Eataine and all the Druchii corsairs and naval officers. Drakira by the Waywatchers and Waystalkers.
Eldrazor by the Sisters of Slaughter for Druchii and the Eternal Guard for Asrai. Anath Raema is represented by the Beastmasters and Beastlords of the Druchii and some of the Hawk Riders in Wydrioth the Pine Crags in Athel Loren. Khaine is represented by so many groups, from the Khainite Assassins (Knives of Khaine) to the Witch Elves (Brides of Khaine) to the Har Ganeth Executioners. Ereth Khial is considered one of the four most prominent gods of the Druchii (according to 8th Edition Dark Elves saying that one of the Seasons is named after her), and Nethu is the patron of Druchii infiltrators in Asur society thanks to his runes draining people of the will to live. Hekarti and Atharti are represented by the Sorceresses of Ghrond.
It seems to me that the only Elven Gods not represented by any groups in particular in canon are Morai-Heg, Estreuth, Hukon, Elinill and Addaioth. They probably didn't know what to do with them.
Archers for Morai-heg. Ellinill and his children make sense, they started off as Gods of Disaster to be propitiated, rather than actually worshipped. Drakira and Mathlann managed to successfully pivot, Addaioth is trying his best to try to compete with Vaul but he's kind of shit at it, and apparently Hukon is worshipped by some Wood Elves though I never found out in what context.