The term "separated oneself from" indicates a sense of isolation or detachment from a group, idea, or belief. Antonyms to this expression would include terms that signify unity, involvement, and engagement. Some antonyms for "separated oneself from" could be "integrated," "involved," "included," "connected," "united," "attached," and "aligned." These words describe a sense of being connected, included, and involved in a group or community. They convey a positive connotation of being part of something larger than oneself and building relationships with others. Overall, these antonyms provide a sense of belonging, togetherness, and engagement that is the opposite of separation or detachment.