Insist on something is a phrase commonly used to express one's strong belief or determination to achieve or obtain something. However, this phrase may become repetitive in speech or writing. Thankfully, there are various synonyms one could use to replace insist on something. These synonyms include demand, assert, require, command, urge, press, and implore. These words are perfect alternatives as they convey the sense of determination and resoluteness that is present in the original phrase. By using these synonyms interchangeably, one could add diversity to their speech or writing, making it more interesting and engaging.