Looking for Tips to Improve My Adobe Stock Sales

Casting a wide net usually catches more fish. 

• Have you created your Adobe Portfolio site yet?  You can share your Stock image Collections with Portfolio to help facilitate more sales from people visiting your site. 
  https://help.myportfolio.com/hc/articles/360036798993-Sharing-Adobe-Stock-Collections-on-Adobe-Portfolio
• Also feel free to promote your work on social media channels. Every little bit helps.

Customers source items from Stock that they can't easily create themselves. Everything from low-tech to high-tech and all points in between. If you offer people what they're looking for, and they can find it in keyword searches, you'll eventually make sales.

Don't be too discouraged at first. It takes a long time to build a large & diverse portfolio that appeals to a wide range of customers. It doesn't happen immediately. For people who contribute infrequently, it can take years. Just keep working at it. 

Good luck!

You'll need to have a much larger portfolio on a variety of topics in order to experience a regular flow of sales. You have quite a few rather simple backgrounds which are easy for any designer to create on their own, so they're unlikely to want to use any of their stock credits to license them.