Yahweh has just told them he will assign them to four groups to kill them—the sword, dogs, birds, and beasts.
Yahweh uses this rhetorical question to emphasize that no one should mourn for Jerusalem. This question can be written as a statement. AT: "No one should have compassion on you, Jerusalem. No one should mourn for your destruction." (See: rc://en/ta/man/translate/figs-rquestion)
Here "Jerusalem" refers to the people who live there. AT: "for you people who live in Jerusalem" (See: rc://en/ta/man/translate/figs-metonymy)
These two phrases mean basically the same thing and emphasize that the people have, indeed, forsaken Yahweh. (See: rc://en/ta/man/translate/figs-parallelism)
Yahweh speaks of himself by name to express the certainty of what he is declaring. See how you translated this in Jeremiah 1:8. AT: "this is what Yahweh has declared" or "this is what I, Yahweh, have declared" (See: rc://en/ta/man/translate/figs-123person)
"left me" or "gone away from me"
Here "hand" represents power. AT: "I will use my power to strike you" (See: rc://en/ta/man/translate/figs-metonymy)
Here Yahweh speaks of scattering the people and causing them to leave Jersalem as if they were winnowed chaff being blown away on the wind. (See: rc://en/ta/man/translate/figs-metaphor)
a farm tool with a long handle and sharp metal prongs, used especially for lifting and tossing grain in the air for winnowing
"I will cause their children to die" or "I will let their enemies kill their children"