Though I’m not a member, I’d second Abysscaller’s suggestion for Nightblade Sentinels if they hadn’t closed recruitment for now.
In addition, Acrona and others have scheduled a whole slew of RP events for Amirdrassil for January, which might be a good opportunity to meet other night elf roleplayers and perhaps find the right guild IC. There’s a Discord link in the first post in that thread, too!