Hi! It would be helpful if you said what you’re interested in, but the pinned thread at the top of the forum might be helpful if you’re looking for a Horde guild: https://us.forums.blizzard.com/en/wow/t/comprehensive-guide-to-moon-guard-horde-guilds/106070/56 Additionally, we have a helpful Discord established, too! https://discord.gg/SmRpCfS
And just in case - there were two undead guilds recruiting recently, The Blightguard and The Undercouncil!
https://us.forums.blizzard.com/en/wow/t/h-rp-the-blightguard-plague-and-pestilence-for-all/799512
https://us.forums.blizzard.com/en/wow/t/the-undercouncil-a-new-undead-rp-guild/688967