Young Jews praying by the Western Wall in Jerusalem
Book of Mormon scriptures (LDS referencing).
2 NEPHI 29: 5 O ye Gentiles, have ye remembered the Jews, mine ancient covenant people? Nay; but ye have cursed them, and have hated them, and have not sought to recover them. But behold, I will return all these things upon your own heads; for I the Lord have not forgotten my people.
2 Nephi 21:12-13 the enmity between the two houses of Israel will depart. We are already seeing Isaiah's prophecy partly fulfilled!
12 And he shall set up an ensign for the nations, and shall assemble the outcasts of Israel, and gather together the dispersed of Judah from the four corners of the earth.
13 The envy of Ephraim also shall depart, and the adversaries of Judah shall be cut off; Ephraim shall not envy Judah, and Judah shall not vex Ephraim.
16 Therefore, renounce war and proclaim peace, and seek diligently to turn the hearts of the children to their fathers, and the hearts of the fathers to the children;
17 And again, the hearts of the Jews unto the prophets, and the prophets unto the Jews; lest I come and smite the whole earth with a curse, and all flesh be consumed before me.
{Later in section 98 it talks about terms for war vs. peace}.
A big part of reaching the Jews will be to understand what the Gentiles lost, the Ten Tribes, after they went into captivity. The Great and Abominable Church that came out of the Old Roman Empire removed teachings, removed covenants, removed understanding, removed practices that our ancient ancestors and Original Apostles and members once knew. How will the Jews recognize us as part of the "family" if we spiritually look too Gentile?
Joseph Smith the prophet, did not fully complete the Restoration in his day. His full potential would have been to live until at least 85 years old--it is implied, according to D&C 130. His life was cut short due to the Saints not being able to bear his departure for the Rocky Mountains, which led to his martyrdom a few days later.
Prepare spiritually to reach out to Jews. Prepare by learning some of their religious vocabulary and concepts. Learn some Hebrew. Open your heart to them.
The bonus that you will get by learning, is a much greater understanding of Christianity and Mormonism. You will get a greater understanding of your own covenants and teachings. It has the potential to bring you closer to God.