Kyrgyz Enthic Ornament Design concept illustrations are rejected, indicating that submission closely resembles content already available. The designs are created by me, making it unique.

Common design motifs are not necessarily unique because you made them.

Use the Reverse Image Search in Stock. 

A keyword search reveals these results in Stock inventory:

https://stock.adobe.com/search?k=Kyrgyz+motif

https://stock.adobe.com/search?k=Kyrgyz+ornament

This is what Adobe Stock says about Similar Content.

https://helpx.adobe.com/stock/contributor/submit-your-content/submit-distinct-content/distinct-content-submission-best-practices.html

Hope that helps.

If an asset is rejected due to "similar content," the issue extends beyond the visual content itself to include the title and keywords.
Using titles or keywords similar to those of assets already listed on Adobe Stock may result in rejection.
The thematic nature of the asset is also a key factor.