The first four lines of the fifth aliyah complete the promises of blessings of the last few aliyot, but then the aliyah talks about severe, terrifying punishments if the Jewish people reject G-d's chukos (statutes) and mishpatim (ordinances) and don't do His mitzvahs.
Rashi counts seven transgressions corresponding to seven punishments. The seven progressive transgressions are: failure to study Torah, failure to do the commandments, rejecting others that do the commandments, hating the sages, preventing others from observing, denying the divine origin of the commandments, denying the existence of G-d, and Rashi says that each of these sins leads to the next.
The punishments include terrible famine and exile. And the Torah says our land will lie in desolation and finally will be paid its rest that it didn't have when we didn't keep the Sabbath of the land (Sabbatical year).
But the aliyah ends with G-d's promise that He will remember us in the land of our enemies, and not break his covenant by destroying us utterly.
