The phrase "excel in" means to perform exceptionally well in a particular area or activity. There are several synonyms for this phrase, including thrive, succeed, shine, do well, surpass, outperform, and exceed. These words are perfect alternatives for describing someone who is excelling in a specific field or skill. Other synonyms include dominate, excel at, master, be good at, be proficient in, and be talented in. Regardless of which synonym you choose, they all convey a sense of excellence and mastery that is associated with someone who is thriving in their chosen area of expertise.