No point being envious of kids who have returned to Japan after living abroad. The best thing for me to do is just study hard.
この場合、次のような言い方ができますよ。
ーNo point being envious of kids who have returned to Japan after living abroad. The best thing for me to do is just study hard.
「帰国子女を羨んでもしょうがないから、私は一生懸命勉強を頑張ろう」
kids who have returned to Japan after living abroad で「帰国子女」と言えます。
ご参考まで!