Jump ahead: the release shipped and it was a triumph. Looking back from that future, what did we do to get there? Back-casting makes bold plans feel concrete.
Pick a date after the release; declare it a huge success.
From that future: write what made it succeed, in past tense.
Read the memories aloud; cluster recurring success factors.
For top factors: what has to start now to make that memory true?
Turn the first steps into owned actions for the coming sprint.