Laʿalla (لعل) usually expresses hope or apprehension, but in some contexts it introduces a desired result whose attainment is uncertain. Its uses should not all be reduced to firm expectation, nor should it always be equated with layta.
«لَعَلِّي أَحُجُّ فَأَزُورَكَ»
Perhaps I may perform the pilgrimage and then visit you.
Both actions are unrealized at the time of speaking. The subjunctive form after the coordinating fa can mark a desired consequence. For a rhetorical analysis, grammar must be read with the nature of the desired outcome and the speaker's communicative attitude.