Agatha Harkness won't be returning to our screens – well, not in a new season of Agatha All Along, at least. Patti LuPone, who played Lilia Calderu opposite Kathryn Hahn in the series from Marvel Studios,

The actress says showrunner Jac Schaffer shut down a proposed Season 2 for the same reason she declined a second "WandaVision"

The story of WandaVision is likely to continue in the upcoming Vision show, which will see Paul Bettany return to his role. In WandaVision, an alternate version of Vision, White Vision, absorbed all of regular Vision's memories and flew away (regular Vision was killed in Avengers: Infinity War).

I want to see more Agatha All Along and so does one of the cast members. There won’t be one. Jac Schaeffer, the creator, came into my trailer and she said, ‘Patti, I’m just here to tell you that Lilia’s going to die,

Agatha All Along season 2 isn't happening, although it's not, per se, because the Marvel show didn't pull in sufficiently large ratings.