Just because I'm bored, let's lean into this "Time jump". So, half the people in existence are gone for, say, 10 years. You can have:
-Stark & Pepper happily married with a kid.
-Ant-Man's daughter is now the crime fighter Stature, helping her father (due to Wasp being "dusted").
-Banner & Natasha finally run off together.
-Cap is now PRESIDENT and, with Rhodey as his VP, has established world peace.
-Thor is in self-exile due to his inability to stop Thanos and save his people.
-Rocket and Nebula are the universes best thieves.
-Shuri, now the Black Panther, rules with Wakanda w/Okoyo still her loyal general.
The conceit is that they have to sacrifice this "new" life, retrieve the gauntlet and reverse the last 10 years to bring back half the universe. Stark has to sacrifice his kid, Cap world peace, etc to make things "right". A4 would end with the Avengers returning to the point immediately after the snap, but before Thanos dips out. Somehow Cap is able to get the gauntlet and reverses the deaths, but dies as a result of using the gauntlet.
Something like that.