When trying to express the idea of "zeroing in on", we can use synonyms that convey the same meaning. For example, we can say focusing on, narrowing down, honing in on, or directing our attention towards a specific target. Other options include pinpointing, fixing on, zooming in on, or centering in on. These words all suggest a deliberate and determined effort to reach a particular goal or obtain precise information. By using these synonyms, we can add depth and nuance to our writing and enhance the clarity of our message.