Wikimedia is more: how sisters can help overcoming problems of the Wikipedias

The number of readers and authors on the Wikipedia has been declining for years. This has various causes, some of which can no longer be solved or cannot be solved in a short term. I suggest two approaches. Firstly, the awareness of the sister projects should be improved in order to reach more or new readers. Secondly, new authors should be trained on sister projects to use Mediawiki wikis.