The phrase "with that" is commonly used in writing and speech to transition to a new point or thought. Some synonyms for "with that" could include "additionally," "furthermore," "moreover," "in addition," and "besides." These words signify that there is more information to be presented or that the speaker is moving on to a related topic. Other options include "on top of that," "not only that," "as well as," and "coupled with." Choosing different synonyms for "with that" can add variety and flow to your writing or speech, making it more engaging and effective.