Doctor Strange in the Multiverse of Madness was a critical success. And marvel wants to increase its possibilities even more with America Chavez's solo movie or series! The marvel cinematic universe still has a lot to show to the public. After Avengers Ultimatum, it may have been the idea that few stories would surpass what we've seen. But without haste a new universe is in front of us, bigger and with more characters than the last one.
In the film, it was established that Chávez is the only version of herself in the Multiverse. So there's still a lot to discover about America Chavez! There are many characters and many directions to go in this moment. Everything will depend on the fans and what they like best for marvel to deliver to them!