Inter service communication where to locate in MVC application

We are building a simple ASP.NET Core MVC application and we have bunch of service calls from controller. This seems to be a problem as controller become flat.

1. Option would be Inter service communication at service end.
2. Façade design pattern would be a solution for that.

But I feel like there might be some other elegant way to handle such. Please share your thought/experience how you gonna handle such a situation ?