There are several synonyms for the phrase "one with" that can be used in different contexts. Some of these synonyms include "in tune with," "in sync with," "aligned with," "connected to," "on par with," and "harmonious with." Each of these phrases carries a slightly different connotation, depending on the situation. For example, "in tune with" might suggest a musical or artistic connection, while "aligned with" might imply a shared goal or purpose. Regardless of the specific word choice, using synonyms for "one with" can add variety, nuance, and depth to your writing.