Despite his wild success having directed the two biggest box office hits of all time, James Cameron doesn’t want to get ahead of himself with Alita: Battle Angel, which he co-wrote and produced as Robert Rodriguez directed. To him, setting up a sequel now, in advance of seeing how the first film does, would be putting the cart before the horse– a bit of an arrogant move that brings to mind a saying about pride and falls.
Article source: https://www.cinemablend.com/news/2466765/why-james-cameron-isnt-planning-an-alita-battle-angel-sequel-yet