When writing, it's important to have a varied and descriptive vocabulary. Instead of relying on the same word repeatedly, you can use synonyms to add depth and richness to your language. For the word "center in," there are many synonyms you can use. Some examples include focus, converge, centralize, streamline, and consolidate. By using synonyms like these, you can convey the same meaning in different ways, making your writing more interesting and engaging. Additionally, using synonyms can help you avoid repetition and keep your writing fresh and dynamic. So the next time you find yourself using the same word repeatedly, try swapping it out for a synonym.