"Putting heart and soul into it" is a phrase that is commonly used to describe someone who is fully invested in a task or project. However, there are many other synonyms that can be used to convey the same message. For example, you might say that someone is "wholeheartedly" pursuing a goal or that they are "passionately" working on a project. Other options include "devotedly," "enthusiastically," and "zealously." Whatever word you choose, the important thing is to convey the sense of dedication and commitment that comes with putting your heart and soul into something.