@Shaunm has a
Journey thread where he tries to rank some websites using tiered linkbuilding. He is super open about everything he does, what seems to be working and what doesn't. In his website there are also some good tutorials and case studies about GSA:
http://shaunmarrs.com/
I don't do tiered linkbuilding anymore. I used to, a few years ago, when it was quite easy to rank parasites using ultimate demon, and the idea I got by reading what shaunm or
@aidenhera say lately is that it has gotten a lot more difficult since all the penguins, and specifically since penguin was made a part of the algorithm. But don't let that scare you, the fact that it has gotten more complicated also means there is less competition doing that!