Aura's reminders are meant to be useful, not noisy. You can turn each kind off.
Habit reminders nudge you when you have not completed a habit. Change them in Profile, Settings, Reminders.
Screen Time Left warns you before purchased time runs out. It lives on the same settings screen.
Routine reminders belong to individual habits. Open the habit, tap the calendar button, then edit or delete the routine.
To silence everything, open iOS Settings, Notifications, Aura. If you receive something that does not fit any of those groups, email help@downloadaura.app with a screenshot.