When starting a new project or endeavor, there are a variety of synonyms to use instead of the phrase "embarking upon." For example, you could say that you are "beginning," "initiating," or "commencing" your project. Alternatively, you could use phrases such as "launching into," "setting out on," or "undertaking" your new venture. Additionally, you could use words like "starting," "commencing," or "getting underway" to convey the sense of beginning a new chapter in your work or personal life. Whatever synonym you choose, it's important to use language that conveys a sense of excitement and positivity about the project ahead.