If you are a blogger & people do not subscribe to your list it may be as a result of you not making it possible for them to subscribe, it could be any of the reasons;

poor quality contents

cos you don't ask them to

your subscription form is not clearly displayed where they can easily see it

cos you do not have a dedicated subscription landing page etc

find out what you can do to grow your mailing list. You must have heard that the money is in the list.

Why people don’t subscribe to your blog and what you can do about it