This is the method the power levelers have used since closed beta and I finally got one of them to give it up. It is by
WoW Classic Hunter Leveling Guide - Warcraft Tavern
WoW Dragonflight 60-70 Character Leveling, Buy 60-70 Power Leveling Service
Buy WoW Classic Power Leveling 1-60 Boost Service
Power Levelling 1-70 Full AFK (Post Nerf Cobalt) 1-70 Under 3 hours – PawnCarry
Gnomeregan Raid Lockouts in Season of Discovery Phase 2
💰Classic WoW - Lvling & Grinding Guide 1-60 - (Part.1 - lvl 1-20) 💰 Afford Mount And Gear!
Shadowlands Leveling Changes & Level Squish - Wowhead
Extended info on xp level to 60 : r/classicwow
Cataclysm Leveling Guides 1-85 - Wow pro
With the 18% exp bonus, I beat my best time 1-50. Only using standard heirlooms. 4 Hours 16 minutes : r/wow
Azeroth Pilot Reloaded is easily the best free leveling addon. @World
