en_tn/deu/28/42.md

rise up above you higher and higher; you yourself will come down lower and lower

This means the foreigner will become superior to the Israelites in power, money, and honor.

he will be the head, and you will be the tail

This means the foreigner will become the leader of the Israelites. See how you translated a similar phrase in Deuteronomy 28:13.