What does 2 Kings 20:1 mean?

Around that time, Hezekiah got so sick he was about to die. The prophet Isaiah, son of Amoz, came to him and said, 'This is what the Lord says: Put your affairs in order, because you’re not going to recover. You’re going to die.' 2 Kings 20:1 - Modern Text Bible

(Hezekiah faces a personal crisis—he’s told by God’s prophet that his illness will be fatal, and he needs to prepare for the end.)