Creating helpful documentation
Good documentation helps both a module's maintainers and its users, and is quintessential for the success of at least more complex modules. That's why you, as a module maintainer, should not put this (admittedly rather unpopular) task off any further but write some helpful documentation rather sooner than later.
On a related note, I just set a good example by finally expanding the handbook documentation for the Search API, and adding some for the Solr search module as well. Go check it out!