All of is a common phrase that is used to refer to the entirety or completeness of something. However, there are several synonyms that can be used to convey the same meaning. For instance, one can use the word "every" to mean all of something, especially when referring to individuals or objects in a group. Similarly, the phrase "the whole" can be used interchangeably with all of to refer to the complete amount or extent of something. Another alternative could be "entire," a word that can be used to indicate the fullness of something without leaving out any part. Therefore, using these synonyms can be a good strategy to avoid repetition and add variety to writing.