How do you get past story mode in GTA5?

To complete story mode in GTA V, you need to finish all main missions associated with the three protagonists: Michael, Franklin, and Trevor. Progress through the game by following the mission markers on the map, engaging in various heists, and completing character-specific objectives. The game concludes with the final mission, "The Third Way," where you must choose how to deal with the final conflict. After completing this mission, you will have successfully finished the story mode.