Here the "spirit" refers to the whole person. Alternate translation: "I am weak" or "I am very discouraged" (See: [[rc://en/ta/man/translate/figs-personification]] and [[rc://en/ta/man/translate/figs-synecdoche]])
The psalmist speaks of Yahweh refusing to do what the psalmist asks as if Yahweh were refusing to even look at the psalmist. This litotes can be stated as a positive. Alternate translation: "Do not refuse to listen to me" or "Please listen to me" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-litotes]])
Here the word "pit" refers to the place of the dead. This phrase is a euphemism for death. Alternate translation: "I will become just another dead person" (See: [[rc://en/ta/man/translate/figs-euphemism]])