As of October 2019, these are the things I want to do next:

Tidy up article: Counting Christians in the Australian census

A number of things on the census side of Mappage:
Allow 2011 data, time series and custom data
Add other visualisations

These are likely to take until the end of the year. If I still have time & energy for the project going forward, there are many things I plan to do, including revising the article specific to Adelaide.