Introverts do well in almost every job. The evidence says that extraversion predicts who emerges as a leader and who is drawn to sales and management, not how well people perform once in a role, so the useful question is not which job titles suit introverts but which work activities you would enjoy, which is what an interests test measures.
What the evidence says
Barrick and Mount’s (1991) meta-analysis found extraversion predicted performance only in sales and management, and weakly; conscientiousness predicted performance across occupations. Judge and colleagues (2002) found extraversion the trait most strongly linked to leadership, but mainly to emerging as a leader in a group rather than to being effective once leading. Neither finding says introverts should avoid anything. They say extraverts are more likely to put themselves forward for, and to enjoy, roles built around persuading and holding the floor.
Two different questions
Which job you would be good at depends on ability, training and conscientiousness far more than on extraversion. Which job you would enjoy depends on your interests, which the six-type model measures, and on how much of the day you want to spend in company, which extraversion measures. A low extraversion score argues for work with fewer unplanned interactions and more time to think, across any interest type: a realistic introvert might like electrical work, an investigative one laboratory science, an artistic one writing, a social one one-to-one counselling rather than classroom teaching, an enterprising one strategy rather than selling, a conventional one accounts rather than reception.
What it does not mean
Introverts are not worse with people. Many are excellent in roles that reward listening, depth and preparation, including leadership of teams that do not need a cheerleader. Nor is introversion shyness or a dislike of people; it is a preference for less stimulation and smaller company, and the facets of extraversion in the 120-item test will show which parts of it apply to you.
What it means for your results
Take the career interests test and read your three highest types; that is the list of work you would enjoy. Then use your extraversion score to choose, within that list, roles with the amount of company you want. The job titles on the career pages link to National Careers Service profiles, which say what each day involves.