The Qur’an describes punishment for wrongdoing and reward for obedience in a variety of ways. Some passages foreground warning, others mercy and encouragement, and others the process of judgment and accountability.
The recurrence of a single principle can thus create different moral effects: fear, hope, self-examination, and motivation to act. Each new mode of expression may correspond to a distinct need of the addressee.
Rhetorical point: noting that Paradise or Hell has been mentioned again is not enough; the imagery, tone, and relationship to the surrounding passage also matter.