There's a 100% XP buff that is active RIGHT NOW until a month from now. Here's key takeaways regarding the speed of this leveling vs leveling in Shadowlands.: CompetitiveWoW
Leveling in Battle for Azeroth 8.1 – Game Gold Fast
WoW - How to get 10% XP Potion Buff in BFA (patch 8.1 ptr) - YouTube
Alliance War Mode Bonus Increased to 30% in Patch 8.1 - News - Icy Veins
Experienced reduced for leveling in 8.1 PTR: wow
Wait on leveling another World of Warcraft character: experience requirements are being massively reduced in 8.1 – Destructoid