If you come here to argue with Adobe's judgement, you will not progress. The people trying to help are not Adobe's decision makers, they are trying to help you understand how to satisfy their standards and to save you from wasting your time.
"Adobe did not tell me what exactly technical issues they are." They will not. That would take more time, and Adobe would need employ more moderators. Adobe do not see their task as teaching or developing talent, but only to accept world class photographs quickly. You need to be fully aware of what the highest commercial standards expect. If you can work through the disappointment and improve your technical handling you may have a good future, your ideas are strong.
I would also mention the composition could be better. Elements are not centred, and I don't understand the proper relationship between the two elements. Is one part cut from the other part, yet far forward so it looks the same size? Or is it a different piece - if so, why? Consider the story your photograph is telling and whether it will match the stories that Adobe's customers want to tell.