Which interpretation best fits “هَلَّا / أَلَا” in context?

Inshāʾ and Tamannī: Requests, Wishing, Exhortation, and Reproach

• Hallā and alā — Why not? / Come, do it.
• Context and the rhetorical choice of request — Wishing, questioning as a wish, conditional wishing, and exhortation.
• Requesting and non-requesting inshāʾ — Requesting and non-requesting inshāʾ.
• Wishing for the impossible — Would that youth might return one day.