Done-for-you migration off MuleSoft Anypoint: we audit the existing estate, convert flows and connectors, rewrite the DataWeave that does not convert automatically, and hand over a Spring Boot codebase your team owns outright.
Two reasons, in roughly this order: the Anypoint runtime is licensed per vCore, so the bill scales with integration volume rather than with how many people build integrations; and a Mule application can only be maintained by people who know Mule, while a Spring Boot application can be maintained by any Java developer.
Not every estate should migrate. If your flows are few and your MuleSoft contract is cheap, the migration will cost more than it saves — the audit says so when it is true. Complex DataWeave, VM queues and Object Store usage are the three things that turn a mechanical migration into a project, and they are priced individually rather than averaged.
Doing it yourself instead? The practical migration guide covers the same sequence. See also MuleSoft alternative and MuleSoft vs Spring Boot.