You have treated the photo in a way I rather like, selectively bleaching the mountains and changing the saturation - or the weather did it for you. I like it, but Adobe will not. They expect editing to be invisible and pictures to be "natural" (so that Adobe's customers, who are not photographers, believe it to be unedited). Also, they expect much more attention to focus.
It appears to have been taken through a car window, you can see some reflections. This can regarded as a fault. Also the clouds have burnt-out in the top left - there is no detail, so this isn't good either.
If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html