I don't know specific reason why my design not accepted despite it is pure hand draw and without any use of Ai

Hand drawn doesn’t mean it meets Stock’s requirements. Read your Contributor User Guide. It contains important information that every contributor must know.

https://helpx.adobe.com/stock/contributor/user-guide.html

• What was the rejection reason? 
• What did you submit to Stock? (Post the full-sized image here.)

Auto-traced conversions of drawings to vector graphics are rarely successful.  

For best results, manual tracing is usually required which can be both tedious & time-consuming.  

Adobe Illustrator is my go-to vector graphics editor.  I’ve never used Canva, and after reading about Canva’s copyright issues, I probably never will.  That’s not to say that Canva isn’t decent software. I just don’t trust it for content that I intend to use commercially. 

“Canva grants you a license to use their elements, templates, and fonts, but you do not own the copyright to them. You cannot trademark designs made using Canva's library, nor can you transfer copyright ownership of these elements to clients or publishers.”

We can’t provide any feedback unless you upload the image in question here….

There’s no attachment visible...at least not to me.  Did you scan as jpg and it’s 4mb at least?