There are various synonyms for the phrase "have made" that can be used to provide more variety and depth to your writing. Some possible options include "created," "produced," "achieved," "constructed," "generated," "formed," "built," "developed," "manufactured," "established," "realized," and "fabricated." Each of these words has its own unique connotations and shades of meaning, so it's important to choose the right one for your context and tone. For example, "constructed" might be more appropriate for a technical or engineering project, while "generated" could be used to describe a new idea or concept. Experiment with different synonyms to elevate your writing and make it more engaging for your readers.