It is well-established that a person having self-confidence and grit will tend to have educational success, as well as long-term success in life. It has also been shown by Ruben O. Martinez and Richard L. Dukes that "The greater the ethnic identity, the higher the self-esteem, purpose in life and self-confidence." in their article titled "The Effects of Ethnic Identity, Ethnicity, and Gender on Adolescent Well-Being."
So it would seem that, aside from grit, retaining one's ethnic identity will help a lot towards being a productive contributor to society.