I’d recommend just putting 3 points of your masteries in the Xp one. Doesn’t need unlocking and it gives you 30 XP every time you get XP. So every tile in a quest you get 30 extra XP. I’m 100%ing Act 3 on my second account trying to get to level 40 for the same reason and I’m getting 110 XP instead of the usual 80-ish. That’s about a 40% increase for me. I think it’s worth it for a few weeks or however long it takes you to get to level 40.
This is my way to level up fast (but i don't really recommend): When i want to push exploring act 3 or 4, i spend units on refills and take advantage of the xp boosts. Always use xp boosts first, whenever you want to pop some refills.
There's no real way to level up that fast. There's simply not enough XP to gain from the quests. If you pop a few XP boosters and grind, then maybe you can reach level 40 before the end of the month.
If I remember right, those levels go pretty quick. Xp boosts and clear content as the others said. Cat quests are nice as others have said, but making progress in the acts is 2 birds/1 stone sorta thing.
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I can't recall how much XP Act 4 paths gives.
Best of luck!
Only three more to go