The phrase "but a step from" means something is very close to happening or being achieved. Some synonyms for this phrase include "on the brink of," "about to," "on the verge of," "at the edge of," and "near the cusp of." All of these phrases convey a sense of imminent action or achievement, implying that the thing in question is so close that it could happen at any moment. Whether it's a breakthrough discovery, a long-awaited promotion, or simply reaching a personal goal, the feeling of being "but a step from" success is both exciting and nerve-wracking. Whatever phrase you choose to use, the sense of anticipation and possibility is the same.