This is microstock. The majority of buyers go to SS, DT and IS looking for specific images and are usually working under a deadline, so they find what they need by doing a search and they quickly select the image or images that suit their needs and buy them, often without knowing, or caring, who took the photo(s).

Buyers don't generally spend their time browsing through portfolios looking for photos they like, hence the importance of the search engine. That's why there are so many threads on this site about the various search engines on these agencies and possible changes to the algorithms that effect sales.

Increasing traffic is something you should do to drive visitors to your own personal site or to your port on sites like fineartamerica, rebubble, crated etc. where it may actually help since those sites sell fine art rather than stock.

A blog would make sense if you sell photos as art. But for microstock purposes, it makes no difference for reasons described in the posts above.

Michael's right.
Look at other photos of your subjects and ask yourself whether and why a buyer would prefer yours to them.*
Sorry to say, most of yours would have been rejected on iStock when they had standards (I speak from experience aka 'tough love'). Just because they accept everything now, barring IP issues, doesn't mean they'll sell.
*Then think about how you can make images that buyers would prefer. (I'm not claiming it's easy!)

I agree, your portfolio for instance at SS is way to small..
I got around 500 images now and seeing daily sales and sometimes some SOD's
Like yesterday I got a $55 SOD so unexpected. But to get more sales you need quality and quantity. And atm you have no quantity.

It doesnt make any sense of promoting your work on stock agencies in my opinion. You will not win clients but the agency on whole.

No buyer will go to a stock agency to look only on your portfolio. A agency has not for nothing millions of images.

Mirco