Final answer:
Another possible reason why John was on the island of Patmos is that he was on a religious pilgrimage.
Step-by-step explanation:
The other possible reason why John was on the island of Patmos is that he was on a religious pilgrimage. Traveling to sacred sites and completing religious pilgrimages were common practices for early Christians. They would visit sites like Jerusalem, believed to be the site of Jesus's crucifixion and resurrection, to deepen their faith and seek spiritual fulfillment.