Instead, nurture the wild idea and let it develop over time by incrementally writing Evergreen notes about small facets of the idea.
If you cannot tackle a subject head on, tackle it obliquely by writing evergreen notes about facets of the idea.
This is an interesting way of reducing the scope of, say, an essay, without sacrificing quality. Instead of writing the whole thing, just write an atomic piece about one of the concepts you need for the larger piece.