We know that the Infinity War storyline is the one that will keep all of the MCU's heroes busy until 2019, when the second part of Avengers: Infinity War will finally be released. However, who is to say that Marvel shouldn't start building another overarching story sooner than that?
After all, after Thanos will be defeated, the heroes will need a new all-powerful being (or group of villains) to keep them in shape. Well, these are some storylines that we would very much like to see adapted for the MCU. Check it out!
Secret Wars

This should be an easy one, with hints of The Beyonder being dropped as soon as the MCU's phase III begins. We have one of the most powerful beings in the Marvel Universe watching as the Avengers are carrying their battle against Thanos and various other villains.
This could be a possibility, of gradually having him kidnap the heroes and the villains alike and sending them onto a planet, say Battleworld, in order to dispute their differences. In the end, after each of the heroes has proved themselves, why not have The Beyonder himself face all the heroes in the same setting of Battleworld?

