When it comes to narrowing something down, there are plenty of synonyms to choose from to express the concept of "more narrowing." Some examples include further focusing, deeper refining, tightening the scope, honing in, delving deeper, becoming more specific, zeroing in, and honing. Each of these phrases carries a slight connotation, emphasizing either the precision or thoroughness of the narrowing process. Regardless of the one you choose, all of them express the idea of getting closer to the essence of something, revealing a clearer picture or a more refined understanding of a particular topic or issue.