This is best suited going through Wix Support as it is not a code issue.
https://support.wix.com/en/article/contacting-wix-customer-care-for-support
You can read more about Wix Blog and notifications in the Wix Blog support pages here.
https://support.wix.com/en/new-wix-blog/setting-up-the-new-wix-blog
https://support.wix.com/en/article/request-turning-off-new-blog-post-notifications-for-site-members
https://support.wix.com/en/article/email-notifications-in-the-new-wix-blog-4800086#allowing-readers-to-unsubscribe-from-your-blog