The most ambitious Avengers: Secret Wars fan theory now seems more probable after reports about the original Avengers team almost returning to the MCU sooner than expected. Every MCU movie released so far has built up to something much bigger than a sequel or a trilogy. Phases 1, 2, and 3 in the Infinity Saga led to the explosive finale of Avengers: Endgame, and the Multiverse Saga will be no different. Just like all the Avengers assembled to fight Thanos, Phases 4, 5, and 6 will likely culminate in a team-up like nobody has ever seen before on the big screen.
https://screenrant.com/original-avengers-return-secret-wars-theory/