Not accepted

As @daniellei4510 said, they are too small. Check for artefacts, aliasing etc at 100%. If you want guidance upload one asset here as submitted to Adobe stock.

To be honest, I don't see much here I could use commercially.  What little I can tell from tiny previews, the details don't look sharply defined.  Soft slurry won't translate well to professional print or digital design. 

What was your goal with these?  What would customers use these for?

Read these links:

• https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
• https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html
• https://helpx.adobe.com/stock/contributor/user-guide.html/stock/contributor/help/photography-illustrations.ug.html
• https://helpx.adobe.com/stock/how-to/tips-stock-image-acceptance.html
• https://helpx.adobe.com/stock/contributor/help/generative-ai-content.html

These are too small to give any meaningful critique in terms of image quality. Upload one or two full sized as submitted. That said, abstract backgrounds and wallpapers are a hard sell. It happens, and I've had some accepted and some have sold, but I would strongly recommend that you use an aspect ratio of 16:9 or 9:16 if you wish to continue producing them, which makes them more suitable for screensavers on desktops or phones. Even then, free wallpapers and screensavers are available by the thousands on the internet, so why would someone pay for one unless it's extremely unique? And as graphic assets for other purposes, I'm not seeing how these would be of interest to a graphic designer.