Please launch the game, load into The Final Season, and go into the Save Slots section. Please delete the save slot you were on, then try starting a new game. You should be able to both import your save data and progress past the opening when you replay on a blank slot.
If you still get a black screen, please delete your in-game save again, then begin a new game without importing your save data from A New Frontier. Instead, play the opening questionnaire to regenerate your backstory and previous choices. You may need to switch to a different in-game save slot to ensure your previous save does not import automatically.