I don’t see how that movie could work with a sequel. I mean I would watch it and give it a chance if they did, but I think it clearly was meant as a stand alone, so should probably stay one.
Although some have given suggestions of having the movie star the same actor but tell an entirely different origin story. Sort of how the Joker’s origin in the comics is “multiple choice”. But not sure that would resonate with the masses, and for it to do even remotely as good as the first one it can’t be something only hardcore comic fans would appreciate.