Contract ended in December and the next one doesn't start until March, so for once I have time to answer things properly instead of firing off two lines between calls.
What I've actually done, so you can calibrate how much to trust any of this. Started in 2011 doing on-page for a local directory. Went full time on links in 2014, which is the year I'd say the modern version of this job began — Penguin had stopped being a bomb that went off occasionally and started being continuous, and everybody who'd built their business on directories and article spinning either adapted that year or left. I've run networks of my own, bought from everyone worth buying from and most people who weren't, done outreach at scale, done digital PR for two agencies who'd never use that phrase, and been through four penalties, two of which were mine and two of which I inherited.
I am not going to tell you a secret method. There isn't one and anyone selling you one is selling you the 2016 playbook with a new name on it. What I can do is tell you what a thing cost, what it did, and what happened eighteen months later, because the eighteen months later part is the bit missing from every guide.
Ask. I'll be in and out of here until March. Some of it I won't answer, mostly where it'd identify a client.