The short answer
Understand the system before choosing an action.
APR is a standardized annualized way of expressing certain borrowing costs. The exact meaning depends on the product and governing disclosure. APR helps comparison, but it does not by itself show the full dollar cost, payment schedule, fees, changing rates, or consequences of a longer term.
Financial Learning Cafe explains the subject. Your current agreement, official sources, facts, jurisdiction, and appropriately qualified professionals control the decision.