You can get the Elixir in Action 2e epub/pdf right now:
Your time is supposed to be worth something.
Other than that Introduction to Mix is the next thing to try after going through the Getting Started guide.
https://repo.hex.pm/guides/elixir/elixir-getting-started-guide.epub
https://repo.hex.pm/guides/elixir/mix-and-otp.epub
https://repo.hex.pm/guides/elixir/meta-programming-in-elixir.epub
