I've been looking at content produced by onboarding initiatives, and it might help to transition that faster to organic content, that is still curated by the onboarding program for some interim period.
Beyond a point structured or deliberately themed content may not be benefiting the individual as a writer.
Ideally our writing becomes compelling enough to consume in the absence of any reward structure.
I haven't fully developed or articulated this thought, but that may be part of the retention piece.