Antonyms for the term "all by one's self" can vary depending on the context in which the phrase is being used. Generally speaking, antonyms for this term would include words such as "together," "with others," "in a group," or "in a team." These antonyms indicate the opposite of being alone or isolated and instead express the concept of being connected or surrounded by others. In terms of emotions or attitudes, antonyms for "all by one's self" might include "happy," "joyful," or "contented" - expressing the idea of being in a positive state of mind due to the presence of others.