When it comes to expanding or enhancing something, the phrase "add to" is commonly used. However, there are a number of alternative words and phrases that convey a similar meaning. These include "augment," "boost," "enrich," "strengthen," "expand," "enhance," "amplify," "increase," "build upon," "supplement," and "grow." Each of these synonyms has its own unique connotation or context that may be more appropriate in certain situations. So, instead of using "add to" repetitively, try experimenting with these synonyms to make your language more diverse and engaging.