The phrase "of one's own" implies ownership or possession. A synonym for this phrase could be "personal" or "private". For example, a personal opinion or a private residence. Another option could be "individual" or "exclusive". For instance, an individual talent or an exclusive membership. "Self-made" could also be used as a synonym, indicating something that was created or accomplished by one's own efforts and abilities. Other possibilities include "autonomous", "unshared", or "proprietary". All of these synonyms convey a sense of ownership and uniqueness that can be attributed to a specific person or group.
