Even though we think about it all the time, we usually take a “sit back and wait” approach to traffic. After all, you can’t force anyone to visit your website. But it’s not as simple as “if you build it, they will come.” And you need more traffic, and greater search engine visibility, if you want to get anywhere with your website and your business.
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.