The olive tree is asking this question to refuse to be king. This question can be expressed as a statement. Alternate translation: "I will not give up my abundance ... over the other trees." (See: [[rc://en/ta/man/translate/figs-rquestion]])
This word for "wealth" is a metonym for the olives that come from the tree. People ate olives as food and crushed them to make oil for lamps. Alternate translation: "oil" (See: [[rc://en/ta/man/translate/figs-metonymy]])
To sway is to move back and forth. Trees sway when the wind blows them. Here this is a metaphor for ruling over people. Jotham is also using irony, saying that the work of any ruler will be useless because the "trees," the people, will not obey anyone who rules them. Alternate translation: "rule over" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-irony]])