It was Jehoiakim’s fourth year of rule. Nebuchadnezzar was only months, or less, away from the first invasion of Jerusalem, and God was still hoping for Judah to repent and return to him so He could save them:
Jeremiah 36:2-3 Get a scroll, and write down all my messages against Israel, Judah, and the other nations. Begin with the first message back in the days of Josiah, and write down every message, right up to the present time. Perhaps the people of Judah will repent when they hear again all the terrible things I have planned for them. Then I will be able to forgive their sins and wrongdoings.
It didn’t happen. They wasted the opportunity, again.