Building millions of high-quality and relevant backlinks in such a short period of time constitutes an "art" in my books. If you´re able to do it, you´re a damn artist
Secondly, if someone did actually find the recipe to build millions of backlinks that will stick and won´t get you penalized and that it will improve your site´s rankings in search engines I highly doubt they will share it with you or anybody else and, let alone, share it on a public forum.
Why?
That information can be worth hundreds of thousands of dollars if it´s monetized properly.
Lastly, in my experience as an SEO consultant and after working with dozens and dozens of clients I come to realize something really important when it comes to defining an effective linkbuilding strategy.
The best and most powerful LONG-TERM linkbuilding strategy is an effective CONTENT MARKETING STRATEGY!
What do I mean by this?
For me, an effective content marketing strategy has to cover three (3) main points...
- Build pillar posts around what your "linkreators" (A term coined by Brian Dean) need/want
- Build dozens of supporting articles around those pillar posts aiming to fulfill user´s search intent
- Spend as much time as possible promoting that content
I hope this helps,
Cheers!!