Now, my guess is that Doctor Strange travels back to the 90’s to warn Captain & Fury for three reasons. One being he needs Captain Marvel to disappear until the Cincinnati Peace Shirt is right & she can get back in the game. If she sticks around, Thanos will become aware of her presence & either attempt to take her out of the equation or devise a plan to complete his mission so that Captain Marvel won’t stop him. The second reason is that when Strange shows up & Nick Fury learns of the devastation that will come to pass, it starts him on his path to creating the Avengers Initiative. The third reason being that when Captain Marvel does disappear for awhile, it needs to be a place where she will not be affected by the power of Thanos’ snap, somewhere it cannot reach her.
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