If both page are closely related (lots of topical overlap), I would merge the unique content from the lower ranking article into the top ranking one, then 301 redirect the lower performing article into the top ranking one. This will make the canonical version more relevant, and give it an immediate authority boost. I would also fetch it right away, do some link building, and possibly a little paid promotion to seed some engagement. Update the time stamp.

Anchor text is the visible words and characters that hyperlinks display when linking to another page. Using descriptive, relevant anchor text helps Google determine what the page being linked to is ?about. When you use internal links (links on web pages that point to other pages on the same web site), you should use anchor text that is a close variation of your target keywords for that page, instead of phrases like click here or download here . But at the same time, avoid overuse of exact match keywords. Using close variations will help you rank better for more keywords.
Although it may have changed slightly since BrightEdge published its report last year, the data still seem to hold true. Organic is simply better for delivering relevant traffic. The only channel that performs better in some capacities is paid search ads, but that is only for conversions, not overall traffic delivery (Paid Search only accounted for 10 percent of overall total traffic).