My suggestion are long-tail keywords, where they all share that one keyword, high demand, low competition, trending upward (see
trends.google.com) and create multi-tier pyramids where you help out sites with Pagerank not too high, but not too low, with a higher percentage of do-follows than the overly competitive high Pagerank sites that are micromanaged. The average number of keywords in a search went from 3 to 4 in 2014, with 25% of searches keywords never looked up, but 86% still click on organic results.
A Maxwell-Boltzmann distribution of Pageranks/Yandex metric scores for the URL's you look up should look like thia:
where if you rank the values in Excel, do a flow chart/histogram, and choose only the values between E-mp and E-bar (or the range you want, I recommend the middle 10,000 where 10k backlinks point to your site and each other for a multi-tier pyramid, as the Eigenvector calculations favor tall pyramids with more tiers, it is impossible to be on top of many other pyramids (multiple high Pagerank/authority URL's) with competitive keywords.
My site should be back up next week. Ask me more about Eigenvectors, Pascal's triangle, etc.