I am new to Adobe Stock and would really value feedback on why the attached photo was rejected. I would love to correct any technical issues if possible.
In my opinion the horizon is too low and it is slightly crooked
As mentioned above you have a slopping horizon so you should correct this in your editing software.
Have a read of these tips for getting photos accepted. Perhaps also upload in the original format - the buyer can crop accordingly.
Thanks for all the great tips!