Try and get the current stack running locally or in a dev environment. Add a “hello world” route - call it and see what happens - iterate.
There are certainly times that you come into a situation that requires a new service. But it shouldn’t be your first inclination. A lot of software development is supporting legacy/other’s code.
Do the new requirements require information from the current database/codebase?
Pretty sure Tom Hanks himself has mentioned he doesn’t understand why it’s so popular.