Your primary reason has to be a personal response, are u moving to pursue your career, or to further your studies, or grant safety for you and your family?etc. The unique skills you bring can be tailored to your specialization/field, any outstanding attribute/skills

talk to immigration lawyer, he will prepare u for test questions and answers like this

Highlight skills in demand: tech, healthcare, engineering, education, etc. Emphasize how your abilities can address US needs: innovation, workforce shortages, and diversity.

This is general advice. Immigration laws are complex. Consult an immigration attorney for personalized guidance.