MCU - 10 Ways Avengers: Endgame Sets Up Phase 4 & Disney Plus
8. Thor 4 Can Focus On Valkyrie
Thor's arc in Avengers: Endgame, while maybe not handled with the most nuance, does come to an interesting conclusion. He finds acceptance in who he is, rather than trying to be who he's supposed to, and with that passes the torch of ruling Asgard to Valkyrie.
That nicely sets up a fourth Thor film, which could then see Queen Valkyrie leading the New Asgard, which by then may well have found a new home off-Earth. Taika Waititi has expressed interest in future Marvel films, so there's a good chance of something like this happening.
The role of Thor is the most unclear within this: Valkyrie would effectively become the Thor character, insofar as being the focus of the film and the ruler, but it's hard to imagine Marvel actually passing the name across, since Thor has been used much more simply as a name rather than a title. Still, they could do something like Siege, with Valkyrie the focus as Queen, with Thor coming back to help fight for Asgard.