Doctor Strange is going to be busy during phase 4 of the MCU because it has been announced that he’ll appear in Spider-Man 3!
Here is what THR had to say:
Benedict Cumberbatch is putting on the cloak of levitation and will reprise Marvel supernatural hero Doctor Strange for the latest Spider-Man movie installment, starring Tom Holland and being made by Marvel Studios and Sony Pictures.
Doctor Strange being in Spider-Man 3 adds fuel to the fire that there will be multiverse problems in the film. With Jamie Foxx being Electro again and Spidey leaving the main MCU to join Sony’s Marvel-Verse after the third film is going to be a wild experience. The fallout from WandaVision is going to be huge, so I cannot wait to see how things will play-out leading up to Doctor Strange in the Multiverse of Madness!