This will happen in avengers 4

Avengers The end game
The movie will happen 8 years after Infinity War
Peppers Potts was part of the universe that vanished
Tony Stark manages to become director of S.H.I.E.L.D.
After 10 years of not seeing each other, from Civil War, Stark and Rogers meet
Stark manages to create his own gauntlet capable of containing the Gems
With the help of Scott Lang and the quantum kingdom, Stark and Steve travel 14 years in the past, to the events after the first movie of The Avengers
Steve, Stark and Scott intercept the Avengers before Thor takes Loki to Asgard with the Tesseract
Those of the future explain to the others what happened and thus the Avengers of the past give them the Tesseract and the scepter of Loki, thus obtaining the Gems of Space and Mind.
The Avengers of the past join Stark, Steve and Scott, helping them to get the missing Gems
Somehow, the Avengers of the past (Cap, Iron Man, Thor, Hulk, Black Widow and Hawkeye) travel to the future to help the Avengers of the future (Steve, Stark, Thor, Hulk, Black Widow, Hawkeye, Ant-man , War Machine, Rocket and Nebula) to face Thanos on par with a Gauntlet
At some point in the fight, Hulk takes the Stark Gauntlet to face Thanos and manages to face him, but Thanos rips his hand off with the Gauntlet
Thanos manages to unconscious the Thor of the past and the Steve Rogers of the future manages to lift the Mjolnir and faces Thanos
In the final straight appears Ms Marvel, but it is not clear if it is she who defeats Thanos
With the help of the 12 gems, the Avengers manage to revive the middle of the universe with whom Thanos ended and only a few Avengers, eye not all the murdered
Stark definitely retires from the heroic world, leaving Harley in his place
There are three major deaths of the main heroes
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When traveling to the past they will realize that one of the Avengers all the time has been a skrull, but this will be known until the end of the film and will lead to phase 4