I recently went through this, what helped me the most was making the Spell: Holy Cataclysm for my cleric. This is a AoE heal. I recommend looking at the wikki for what’s needed to make it. The items needed are tradable, so you can try to find someone in game to obtain the needed mats to make it. If you cannot find them, let me know, I’m more than happy to give you what you need. Just send me a tell, Vindicatedwrath is my main tank. Also, the Druid and shaman rain Aoe heal helps a lot as well.