A theory on Captain Marvel and Endgame tie-in: In the Infinity War end-credits scene, Fury of course uses a "pager" that teases Captain Marvel. Or...so we assume. After all, Fury and Captain Marvel are going to meet up in the '90s, a time when pagers were actually a thing. So we, the audience, are led to assume that the device that looked a lot like a pager actually is a pager. I don't think it is.
The MCU version of Captain Marvel can time travel, as we've been told. I'm guessing that one of the reasons she presumably "disappears" from the time Captain Marvel ends in the 1990s up until some time in Endgame in the present time is that, at the end of Captain Marvel, she time travels to the present day. I.e., she disappears in 1990-something to reappear in 2019-ish. And the pager isn't a pager--it's some sort of homing beacon that allows her time-traveling ability to zero in on the time and place to reappear. Fury, having known her in 1990-something set this plan in motion with her back then, and knew there would be a time and place in the future for him to activate it so that she would appear there and then, which he does at the end of Infinity War.
This would nicely explain her disappearance during the intervening years, and would explain why Fury was using such an outdated piece of tech to presumably "call" her in the present day. Obviously, this is just speculation. But I don't see any major holes to poke through it right just now.