Explanation:

- Resolution: This is the correct answer. A New Year’s resolution is a tradition where people commit to goals or improvements for the upcoming year. It fits perfectly with the desire to “think positive always.”

- Repetition: This option doesn't fit the context. Repetition refers to doing the same thing repeatedly, which doesn't align with setting a New Year’s goal.

- Confession: This involves admitting to something, especially a wrongdoing, and does not relate to making a New Year's goal or ambition.

- Celebration: This involves marking an occasion or event, often with festivities, and doesn’t align with forming a personal commitment or goal.