Hey there buddy,
i know that feel. Playing this game for 16years now, and at some point you have seen everything. The normal Endgame Content gets somewhat boring and you are missing the good old Times where you just did stupid stuff in this beautiful world with some friends.
If you don’t mind playing Undead and naming your Character a variaton of “Abomination” i am pretty sure we can offer what you are looking for. 
We have about 20-40 (peaked to 90) people online. But don’t worry, its no typical mass guild! Everyone knows everyone and we are all really helpful and nice to eachother. Since we get new member on a daily basis we don’t have the typical “5-IRL-Friends-Circle”. Our Guildchat and our Discord is pretty chatactive since we have always something to do together. We run dungeons, we raid (yes, as undead only), we do RBGs but most importantly we just play together. And if its a Raid to Stormwind, we will Raid stormwind. Normally we have atleast 1 big event each week.
Last week we did an Gurubashi-Fistfight. The week before we did an Hide & Seek with pretty huge gold prices. Every few month we host a little Transmog-Competition with around 40 People attending. And if we don’t do stuff like that, we are normally recording for a new YouTube Video.
So, thats just a small screen of what we do. If i sparked your interest make sure to visit us on Discord and just chat with the people there, if you like.
Hope to see you soon too.
Here are some more infos: