It's not World of Warcraft until you've modded it to death. Here are WoW's best leveling add-ons for SoD.
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Exp Boost Up To Level 40, Mount Price Halved, 20 Man Molten Core Coming to Season of Discovery - Warcraft Tavern
Best addons for leveling in WoW Season of Discovery - FrostyBoost
WoW Classic SoD & Hardcore Warrior Weakauras & UI: Protection, Arms & Fury - Quazii UI