Hi elib,
I understand your frustration. When I started I had a rejection rate of about 99%. Now I have an approval rate of about 99%. To improve your approval rate you need to learn a few things including how to inspect your images, and make corrections, and a mental picture of the exposure that is accepted.
Open one of the files rejected for noise and zoom it to about 200%.
Look in the darker areas. Do you see very small spots? Do you see what appears to be water mark in the black areas?
Those are noise. Noise shows up in the skin areas of models, and the sky tend to be grainy when noisy.
Most of the time those images rejected for exposure, appear to be underexposed for one reason or another. Is it that you cannot see details in the shadowy areas? In this case black and shadow might need to be adjusted. Did you take the photo in low light,? Exposure need to be adjusted. Or are there areas of your image so bright that the details are blown out?
Rejection can be very good training tools along with help from Critique Forum if you upload some of these rejected images with reasons for rejection.
In the mean time, along with the link from Joan, read up on Create better photos for Adobe Stock with 7 tips for success | . Pay attention to the illustrations and their details.
In case you haven't been doing so, post processing is absolutely necessary. This is made easier if your images are taken in RAW.
Sutterstock and Adobe are not the only ones that are looking for high quality images. There are others.
Best wishes
JG