The people's heart represents their attitude toward God. If Yahweh is speaking to the people, this can also be expressed with the word "you." AT: "but you people have a stubborn heart. You turn" or "but you people are stubborn. You turn" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-123person]])
The word "it" refers to the people. Here "goes away" represents disobeying God. AT: "They rebel and disobey me" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Here "keeping the fixed weeks of the harvest" represents making sure that those weeks happen at the right time. AT: "making sure for us that the weeks of harvest happen when they are supposed to" (See: [[rc://en/ta/man/translate/figs-explicit]])
Good things "coming" represents good things happening. "Because of your sins, good things have stopped happening to you" (See: [[rc://en/ta/man/translate/figs-metaphor]])