Your answer will vary depending on the company, the position, and your career goals. You could mention that you plan to keep searching for other job openings at the company. Consider developing skill sets or gaining experience to make you more attractive to potential employers.
Here are some other sample answers:
• My goal is to find another position that suits my schedule and goals in this field.
• I will continue to keep an eye out for vacancies within the company and opportunities for advancement.
• To enhance my qualifications for advancement, I am exploring more training and completing additional credentials.