Antonyms for "more insociable" would be words that suggest a friendly or outgoing nature. Some possible choices might be sociable, friendly, gregarious, outgoing, or affable. These words describe people who enjoy being around others, enjoy conversation, and seek out company. They are the opposite of "insociable," which suggests that someone prefers to be alone or isn't interested in interacting with others. Other antonyms for "more insociable" might be words like extroverted, cordial, or convivial, which all suggest a desire to connect with others and build relationships. Whatever word you choose, it will convey a sense of warmth and openness that is the opposite of insociability.