"To begin with" is a common phrase that we often use when we start to discuss something. However, using the same phrase repeatedly may make the conversation boring. Therefore, it is beneficial to have some synonyms for the phrase "to begin with." A few alternatives that you can use are "to start off with," "first of all," "initially," "for starters," "at the outset," "to kick things off," "to launch into," or "to lead with." Using these phrases not only adds variety to your conversation but also keeps your listener's interest intact from beginning to end. So next time, instead of "to begin with," try one of these alternatives to add some pizzazz to your speech.