Experience gains are now increased by 70% on live servers and the XP required per level from 50 to 60 won’t be going live before November 15, which is why it’s currently faster to level alts on retail instead of waiting for the XP reduction to go live.
Hallow’s End provides you with a +10% Experience buff for 2 hours.
Unburdened (Alliance Buff) – You have cast your worries into the Wickerman’s fire. Increases experience earned and reputation gained by 10%. Lasts 2 hrs.
Grim Visage (Horde Buff) – You have painted your face with the Wickerman’s ashes. Increases experience earned and reputation gained by 10%. Lasts 2 hrs.
War Mode gives you a 10% Experience buff.
Winds of Wisdom gives you a +50% XP buff.
All 3 buffs currently stack for up to +70% increased Experience gains. Winds of Wisdom is going away on November 15 in the Americas or November 16 in Europe.
The Level 50-60 XP reduction won’t go live before that, so do not hold on off leveling your characters for Dragonflight.
If you are leveling to 50, there is an extra account-bound potion in BfA which costs 5 commendations and increases XP gains by an additional 10% for 1 hour. You should get enough commendations by completing 1 Warfront.