Conspiracy to get rid of him
I've heard some fascinating stuff that's been going on behind the scenes at Disney and Marvel studios on YouTube, and honestly, if you listen to Cameron Pasha, it's shocking. But it makes sense too.
There's a reason his Marvel stuff had been doing terribly since "Infinity War." Feige and Bob Chapek (owner and CEO of Walt Disney Studios) don't like each other now, and there's been an ongoing feud going on between them. The long-established elite in that branch of Hollywood (the people you don't see) don't like Kevin either. They've been secretly sending Feige people to give him bad advice about how to do Marvel movies, and the idiot's been falling for the traps, hook, line, and sinker. They basically want to make him look bad so they have cause to get rid of him.
If anyone wants to watch the videos, please ask, I'll post links below.