I mean; what kind of guild are you looking for? Whats your character like?
At any rate, I could point you towards [A-RP] Night Elf Roleplay - #130 by Zalia-argent-dawn which has a list of most(if not all) things Night Elf including Guilds and events!
As for some of the Guilds; we have
the Dirge of Teldrassil, the Thornglaive Sentinels, The Nightblade Sentinels & the Glaivewings Sentinels
Perhaps you find one of these to fit your character!
Otherwise I would suggest The [PCU] 😈 now recruiting! [250]! They have lots of different Guilds, not always all sticking to one race!
Have fun, and I hope you find a fitting guild for yourself and your characters!