I think the last slot in that list (or perhaps a 2023 slot) could be a non-avengers team up movie. Obviously the Avengers will continue as a franchise but I think they'll want to diversify the type of teamups and crossovers that can occur. I'm thinking a cosmic team up movie with some combination of the Guardians, Thor, Captain Marvel, Valkyrie, Nova, and a couple of Eternals.
I think Fiege (and James Gunn) are keen to expand that corner of the MCU, almost forming a cinematic universe within a cinematic universe, with spacebound franchises that crossover with one another, occasionally connecting back with the Earthbound heroes.