Cannot upload a picture to adobe stock

Your asset is missing contrast. a moderator may also conclude that the horizon is slanted. 

If it has beeen accepted before, that does not mean that it gets accepted again. I advise no one to delete an accepted image unless there is a real problem with it.

I did some dehazing in Photoshop to lower the fog and brighten up the foreground. You might try that and resubmit.

I haven't had much luck with getting misty/foggy images accepted. I suppose it can look like exposure or focus issues to the Moderators. This is why you never want to delete a previously accepted image! You could end up with a different Moderator when you resubmit who doesn't think it meets the quality hurdles.