When it comes to talking about what we're passionate about, the phrase "main interest" may not be specific enough to capture the depth and complexity of our feelings. There are a variety of synonyms that can help us communicate our true passions in a more nuanced way. For example, we might say we have a "primary focus" on art or music, or that we're "most invested" in a particular hobby or cause. Other options include using terms like "central passion," "core pursuit," "key obsession," or even "dominant fixation." Whatever language we choose, the most important thing is to communicate our passions clearly and effectively, so that others can understand and appreciate what makes us truly unique.