Boosting my sales to gain higher rankings as stock contributors

When you figure it out, let us know.

There is no one-size-fits all way to boost sales, except to give customers what they want when they want it.

Good luck.

While I highly doubt it drives potential buyers to my site (the chances are probably nil), I do use my Facebook business page and Bluesky to post images that I've sold and that link directly to the same images in my portfolio if the image is clicked on. Some social sites, such as Instagram, only post a link, not the actual image, which is even more pointless. But it lets followers (many who are friends or at least acquaintances), see what I'm up to. I DON'T post high-res images that do not link directly to my portfolio out of concern for copyright infringement. 

You can promote your portfolio anywhere you want, such as on your social media accounts; however it is doubtful as to whether that will drive any additional sales. Buyers find your assets by searching via keywords. Make sure that your titles and keywords are thorough and accurate. Search your images yourself. If they don't appear in the first few pages of search results, they are unlikely to ever be found or licensed by a Buyer. 

There is only one effective way to promote your work in Adobe. Continue uploading, have high quality assets, have assets that are in demand and have real good metadata.

Save other promotion ideas for saleing your work outside of Adobe.