Have you fully explored ACTs 1-3 yet ?? Are you able to do Act-3 Thanos without any Potions ??
People played a long time before there even was such a thing as Act-4 or even 4* heroes in the game. And plenty (probably too much) to do with all the Monthly Event Quests and such, to worry about racing through the ACT-4 quests (those are there forever, you have plenty of time to strengthen your roster for those).
I would explore act 3, and maybe do some monthly eq. You could probably join an alliance and do some AQ, but I wouldn't mess with any AW just yet. You could also benefit from a bit of arena as well
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People played a long time before there even was such a thing as Act-4 or even 4* heroes in the game. And plenty (probably too much) to do with all the Monthly Event Quests and such, to worry about racing through the ACT-4 quests (those are there forever, you have plenty of time to strengthen your roster for those).