More surely is a phrase that expresses confidence, conviction and certainty that something will happen or is likely to happen. There are several synonyms for the phrase, including more securely, more definitely, more reliably, more confidently and more firmly. These synonyms imply that whatever is being discussed, whether it is completing a task or achieving a goal, has a higher degree of assurance and a better chance of success. By using these synonyms, you can emphasize the importance of the outcome and instill a sense of trust and reliability in those who are involved in the process.