What must I do after breaking a single oath that I swore three times, and delaying expiation for a period ranging from five months to a year and a half, knowing that I possessed money and did not fast?

If a person takes multiple oaths concerning one matter and then breaks them, the majority of scholars hold that only one expiation (kaffarah) is required. However, the Malikis are of the view that expiations are due according to the number of oaths, unless the intent was to emphasize. As for delaying the expiation, it does not nullify it, and repentance and seeking forgiveness are required for this delay.