maintaining a backend service that started with asp net mvc several years ago. adding new endpoints now means touching the same controller files over and over and the routing has become a tangled web. tried extracting some logic into services but the controllers still feel bloated and testing each change takes longer than it should.

watched a few walkthroughs on minimal apis but they always start from scratch instead of showing how to gradually shift an existing project. the business side keeps asking for quicker iterations and im running out of clean ways to deliver.

has anyone found an asp net mvc course that actually guides you through modernizing controllers without a full rewrite?