Why my alot of ai generated rejected in this week?

What rejection reason was given?

Post a full-size image of one that was rejected.

Meanwhile, read your Contributor Use Guide.  Adobe Stock customers expect the highest visual and technical quality for use in commercial projects.

• 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

They are probably not up to the quality requirements and Adobe seems to check the assets better than they did in the past, or there are more experienced moderators working.

It's hard to answer your question without seeing your rejected images. If you show us your work on this forum, several contributors will certainly be happy to help you.
Please no thumbnails but the images as they were submitted.