HELP!

It is a pretty scene and could be improved for your own use; however, it still won't meet the quality standards for Adobe Stock. The small sensor on your phone camera is the chief culprit. Zoom in a bit and look at those banks of trees which have a sort of impressionistic blur with just blobs of color and no detail. That happens because small sensors just can't capture enough detail.

This is still far from perfection, but this is closer to the tonal range you need to reach.

Sorry, but your asset is far from perfect. It's overprocessed and out of focus, has a weird white balance. It's also overexposed. Blacks are missing on the histogram. The camera was probably a small sensor camera as all fine detail has been "optimized".

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