The correct answer is conscientiousness
Of the existing personality theories, the most widely used to know about introversion is the Big Five.
The best conscientious scorers tend to be very reliable and hardworking workers. You are likely to see one of them creating many to-do lists and breaking big goals in possible steps. They rely heavily on the organization and use a methodical approach to achieve their goals. They are willing to devote a huge amount of effort to succeed.