The Torah has assured us that in the end, at the close of the period of exile, Israel will turn to teshuvah and immediately will be redeemed, as it is said:

“And it shall come to pass, when all these things are come upon you, the blessings and the curse, which I have set before you, and you shall rethink about yourselves while you are among all the nations, wherever G‑d your G‑d has driven you, and you shall return to G‑d your G‑d, and hearken to His voice according to all that I commanded you this day, you and you children, with all your heart, and with all your soul;

that then G‑d your G‑d will turn your captivity, and have compassion upon you, and will return and gather you from all the nations wherever G‑d your G‑d has scattered you”

- Rambam, Hilchot Teshuvah