There are numerous synonyms for the phrase "in success," including triumphantly, victoriously, prosperously, and lucratively. Other options include thrivingly, successfully, auspiciously, and fortuitously. Additionally, one could use the term triumphantly, indicating a sense of victory and accomplishment. Alternatively, you could employ the phrase auspiciously to denote a sense of favorability and good luck. Ultimately, the specific synonym you choose will depend on the context of your writing and the particular tone you are trying to convey. Regardless, it's important to find a synonym that effectively conveys the idea of achieving success and experiencing positive outcomes.