Passage
[then] will I also cast away the seed of Jacob, and of David my servant, so as not to take of his seed to be rulers over the seed of Abraham, Isaac, and Jacob: for I will turn their captivity, and will have mercy on them.
[then] will I also cast away the seed of Jacob, and of David my servant, so as not to take of his seed to be rulers over the seed of Abraham, Isaac, and Jacob: for I will turn their captivity, and will have mercy on them.
Jeremiah 33:24 Hast thou not seen what this people have spoken, saying, The two families that Jehovah had chosen, he hath even cast them off? And they despise my people, that they should be no more a nation before them.
Jeremiah 33:25 Thus saith Jehovah: If my covenant of day and night [stand] not, if I have not appointed the ordinances of the heavens and the earth,
Jeremiah 33:26 [then] will I also cast away the seed of Jacob, and of David my servant, so as not to take of his seed to be rulers over the seed of Abraham, Isaac, and Jacob: for I will turn their captivity, and will have mercy on them.
The verse centers on "mercy", "cast", "away", "seed", "jacob", "david", "servant", and "take". It is saying that the verse draws attention to "mercy" and "cast", so its meaning should be read from those terms before moving to application.
The prior verse says "Thus saith Jehovah If my covenant of...", giving immediate footing for "mercy" and "cast". In Jeremiah context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "mercy" and "cast" with trust shaped by these words, not by a vague optimism outside the passage.