Between-ness as structural principle
Diaspora fiction is organized by the condition of living between two or more worlds, and the best diaspora fiction makes this between-ness structural rather than merely thematic. The character who is never fully at home anywhere — who is too Western in one context and not Western enough in another, who is too assimilated for the old country and too foreign for the new one — experiences the world from a specific vantage point that produces specific perceptions. Build your narrative structure to reflect this double perspective: scenes that play out differently depending on which world the character is operating in, conversations that carry different weight in different languages, memories that illuminate the present in ways that require the reader to hold both contexts simultaneously.