سَلْ is an imperative meaning “ask.” أَسْأَلُكَ is a present-tense verb meaning “I ask you,” with كَ referring to the person addressed. The two forms organize the request and response.
أَوْ غَيْرَ ذَلِكَ؟ means “or something other than that?”, and هُوَ ذَاكَ means “that is what I want.” This short exchange reveals Rabiʿah’s preference for lasting success rather than a passing benefit, while the final answer connects elevated hopes to responsible personal effort.