There is no magic bullet. Also, nostalgia is brain rot.

This article fails to understand that all groups have a life cycle. Clay Shirky's essay is the canonical explanation:

http://www.shirky.com/writings/herecomeseverybody/group_enem...

Nostalgia in online discussion groups suffers the same problem: you can't go home again, because you're not your previous self any more. http://davidgerard.co.uk/notes/2014/06/03/internet-fundament...