Romaine Wiki, 04/05/2015 18:51:

There is after a contest like Wiki Loves Monuments no environment at all
that fits to handle all the participants and give guidance so that they
can continue to be active. Those users that participated in a contest
fall in a black hole afterwards. [...]  What Wikipedia misses
is a social environment that fits with these people and gives them
stimulation.

Send them to Wikisource, then! :