I have been waiting a very long time, for Niantic to send me an Email about my nomination for a PokeStop, even though they said they will contact me soon. Please answer.
We need more information. Did you submit the pokestop through pogo and are waiting for the email confirmation? Or are you saying you submitted it and have been waiting a long time to see if it was approved?
How long ago is this? Lately my nomination can take 1-3 weeks before it reach agreements. Depending on what you submit and how many reviewer in your area, it can be shorter or longer.
Welcome to the forum!
You can check the status of your nomination on your contributions page at https://wayfarer.nianticlabs.com/new/nominations
Let us know if you have any questions about what you see there.