Good question. Thanks for asking.
Firstly, I CANNOT unsubscribe you no matter how much you ask me or want me to, and no matter what language or how many exclamation marks you use.
The fact is, you subscribed and only you can unsubscribe.
If you want to do this, go to the email WordPress.com sent you telling you there is a new post.
Hidden somewhere towards the bottom of the email there is an ‘unsubscribe’ link which you need to click on to take your name off the email list.
May I restate ONLY YOU CAN DO THIS. I have no access whatsoever to the email subscription list. Matter of fact, I cannot even see who is on that list unless they are fellow WordPress.com members.
So, you are free to unsubscribe. Go and may peace be with you.