Tiered link building strategy is still working.
Tier 1 - PBNs, Web 2.0s, Social media accounts, Profiles, Parasites, Edu & Gov links, Press releases, Articles and Guest posts
Tier 2 - Google stack, Comments, Blogs, Google sites, Social bookmarking, Social signals, Cheap PBN/Web 2.0 links, Sharing sites
Tier 3 - GSA and/or Xrumer links
This works best if you group your links into certain categories and build next tiers accordingly.