"To itself" is a phrase commonly used to describe something that is directed or confined within its own boundaries or characteristics. There are several synonyms that can be used to express the same meaning as "to itself," including self-contained, self-sufficient, self-reliant, and self-determined. Self-contained indicates something that exists independently and is not reliant on something else for support. Self-sufficient suggests a level of independence and autonomy. Self-reliance indicates the ability to handle one's own needs without assistance. Finally, self-determination suggests an entity that is capable of making its decisions and controlling its own destiny. These synonyms not only convey the meaning of "to itself," but they also help to add depth and nuance to the language.