Yeah, there is kinda this awkward thing going on with Wanda since the parts that makes her characters end up being rather "exclusive".
Avengers became this "exclusive to A-Listers" place, at least the main team.
Mystical side is like "Dr.Strange is already enough", so no magic team book or anything.
And there are also X-books, did anyone want that? I don't know much about the current status of X-franchise but even actual X-characters kinda struggle.
And another solo book is like a day dream.