en_tn/jer/46/18.md

someone will come who is like Mount Tabor and Mount Carmel by the sea

This refers to the nation of Babylon who will be as overwhelming to the nation of Egypt as the these two mountains are to the plains that surround them.

Get ready for yourselves your baggage

AT: "prepare to travel"

Memphis will become a horror and a ruin

Both these phrase are saying basically the same thing, that the capital of the nation of Egypt will be completely destroyed. (See: [:en:ta:vol2:translate:figs_doublet]])