Putting one's heart and soul into something is an expression that signifies giving your all to it. One synonym for this expression is "pouring oneself into it," indicating that you are dedicating all of your energy and effort toward achieving the desired goal. "Going all-in" is another synonym, suggesting that you are fully committed and willing to take any risks necessary to achieve success. "Throwing oneself into it" also works as a synonym, meaning that you are diving deeply into the task at hand, putting all of your passion and dedication into it. Ultimately, any of these synonyms convey that you are fully invested in something, giving it your all in hopes of achieving success.