LitCharts assigns a color and icon to each theme in The Sun is Also a Star, which you can use to track the themes throughout the work.
Immigration and the American Dream
Passion vs. Reason
Interconnectedness and Destiny
Isolation vs. Connection
Summary
Analysis
Daniel shares that his most embarrassing moment was earlier, in Dae Hyun's store. He suggests that everyone should get a "family Do-Over Card," which would allow someone to start over with a new family. Natasha lists all the reasons that would be a bad idea, and they wonder if they'd choose to switch out of their own families. Natasha finally laughs and says it'd be chaos if everyone could mess with everyone else's life, but Daniel thinks people already can do that.
Daniel is able to discern that people already have a great deal of power over each other’s' lives because he so deeply believes in the interconnectedness of all beings. He also understands that Natasha has fundamentally changed how he thinks about his life, even if he's not necessarily switching out of his family.