How to use multiple C# repositories and services?

Question

Software design

Good afternoon everyone. I am writing an educational project using a three-layer architecture and DI. There was a question, I can not find an adequate answer to it on the network. The problem is this: I have 1 class in the DAL responsible for communicating with the base, as it should be, but I don’t understand how I can divide this class, for example, into several in order not to violate the single responsibility principle. That is, in one repository I have CRUD operations for the user, in the second one, and so on. I tried to create another class, an interface for it, throw it into the constructor on the right layers, but nothing happens. Please tell me how to organize it all.