Things that extend a wiki career
Fragment of a discussion from Talk:Editor Trends Study
I found a study that shows editors who participate in talk page discussions are more likely to stay. Same with editors who participate in improving FAs. Editors who participate in both are MUCH more likely to stay.
Of course, this could be a correlation and not a cause. Someone who is engaged with improving featured articles and collaborating is the kind of person who would already find Wikipedia more interesting. But it would be interesting to see if it would help to nudge someone towards a good WikiProject that's very collaborative and interested in featured articles. I know it stepped up my participation a lot.