Just creating amazing characters in a memorable world who are struggling to obtain a goal(s) and writing the story with an original voice still isn’t enough to start a screenplay. A novel, maybe, but not a script.
The prose writer has freedom to use anything, go anywhere, use any tense, and explore any point of view. The screenwriter, however, is bound by form - not formula.
Screenplays have a very specific form, and if you ignore that form, it will not serve you, your story, or your audience, and it will definitely not help your screenplay.