When we are trying to convey that we are focusing on a particular topic or goal, we often use the phrase 'zeroed in on'. There are a number of alternative phrases that can be used for this same purpose, including honed in on, fixated on, centered on, concentrated on, targeted, pinpointed, focused in on, and zoned in on. Each of these phrases can add a slightly different nuance to the meaning, with some implying a more intense or narrow focus than others. Ultimately, the choice of phrase will depend on the personal style and tone desired, as well as the specific context in which the phrase is used.