With a Zettelkasten... you build up incrementally, on notes and concepts.

Eventually building up to the point, where you are able to easily write on topics that have been bubbling your interest.

Developing an area of notes where you lay out the Themes, you are exploring could be immensely helpful. So far with my notes I have named my organizational method as Concepts. Yet I still need to dive back into these concepts, to uncover potential areas to explore deeper.

Note taking is an intense process, but yet it can prove fruitful!