When it comes to expressing happiness or delight, there are a variety of synonyms to choose from instead of using the phrase "rejoice in." Some of these options include "celebrate," "enjoy," "appreciate," "take pleasure in," "savor," "delight in," "cherish," "treasure," "bask in," "luxuriate in," "indulge in," and "be glad about." Each of these choices can add a unique and nuanced perspective to your writing or speech, depending on the context and audience. Experiment with using different words for "rejoice in" to elevate your communication and convey your emotions more effectively.