The antonym for "by itself-oneself" is "together-with others." The phrase "by itself-oneself" means to act or exist independently, whereas the opposite is to be a part of a group or community. When we work together with others, we can achieve greater success and accomplish more than we could on our own. Collaboration allows for the exchange of ideas and perspectives, which can lead to innovative solutions and creative problem-solving. Additionally, being a part of a community provides a sense of belonging and support, which can improve mental and emotional well-being. Therefore, it is essential to balance independence with collaboration to lead a fulfilling life.