The phrase "and so on" is often used to indicate that a list is not exhaustive and there are other items that could be added. There are numerous synonyms for this phrase that can be used to convey the same idea. Some alternatives include "et cetera," "and the like," "and such," "the rest," "and others," "including but not limited to," "and more," and "so forth." Using these synonyms can add variety to writing and avoid repetition of the same phrase. However, it's important to ensure that the chosen synonym accurately conveys the intended meaning and is appropriate for the context in which it is used.