There are many different synonyms for the phrase "involve in." Some of these include "participate in," "engage in," "take part in," "be part of," "attend to," "occupy oneself with," and "embark upon." Each of these phrases has slightly different connotations, but they all share the fundamental idea of being actively engaged in something. Some of them, like "participate in," suggest a more direct and active role, while others, like "attend to," suggest a more passive or supportive role. Ultimately, the choice of synonym will depend on the context and tone of the writing, as well as the desired emphasis on the individual's actions.