Evolutionary Architecture: Moving from Monolith to CA.

Start by extracting 'Use Cases' from controllers and creating 'Interfaces' for your database models.

Don't refactor everything at once. Pick one feature. 1. Create a DTO for the request. 2. Move logic from Controller to a Use Case. 3. Define an Interface for the DB access. 4. Gradually move data-only models to business-logic-rich Entities.