How can fiction writing be best used for achieving enlightenment?

It seems that many fiction writers were very wise, including those, who had little or no access to spiritual teachings (e. g. the Strugatsky brothers). Allegedly, in Japanese culture non-spiritual activities (tea ceremony, archery, calligraphy, martial arts) are being used as tools for spiritual development. I heard some people say that any activity can be used for approaching enlightenment. If it's true, then fiction writing can be used in the same way as well. If someone spends a lot of time and energy writing fiction books (they regard it as the most important part of life), what can they do in order to get maximum spiritual benefit from this activity? I. e. if the enlightenment is the goal, and fiction writing is the engine, what kind of maintenance acts is necessary to reach the goal using that engine? Notes: 1. Preferably, it should be concrete advice, ideally with some data supporting it. 1. Those recommendations should be compatible with (or adaptable to) the Diamond Way Buddhism .