"Put one's heart and soul into it" is a phrase used to describe an individual's enthusiastic and wholehearted participation in a task or activity. Some synonyms for this expression are 'dedication,' 'commitment,' 'devotion,' 'passion,' 'zeal,' and 'enthusiasm.' Each of these words has a slightly different connotation, but all capture the spirit of putting one's all into a project. To be dedicated to something is to be unwaveringly committed to it, while passion implies a strong feeling of enthusiasm or excitement. Similarly, zeal would suggest an intense enthusiasm for a project or endeavor. In summary, there is no shortage of synonyms for "put one's heart and soul into it," but all convey a sense of devotion and energy towards a goal or task.