If you want a guild with a specific focus on the Zandalari, I can recommend the Painted Shields and Legacy of Zul. The former is a classic flavour of Rastari military RP accepting other tribes as well, whereas the latter is more of a politics/faith Zanchuli rp collective of priests and scholarly characters.
If you’d like to give neutral troll rp a go instead, I recommend the Whitescar Pact! They’re aligned with neither Horde or the Empire, and accept most tribes.
All of these guilds are ran by nice, friendly folk and always enjoyed my interactions with them!