B2 visa got rejected with 214(b), where did I make mistake?

[oyun]

I was asked these questions, no documents were asked.

1. Do you have a relative in the United States?
- Yes, my sister is there.

2. Which city does she live in?
- *** city, *** state.

3. Have you traveled to other countries?
- Yes, i studied and traveled to China before.

4. What do you do?
- I work at *** LLC.

5. Can you elaborate on what you exactly do?
- I work as an assistant manager.


I want to reapply. How should I proceed?