Follow My Blog Post plugin allows your visitors to follow changes on your site for particular post, page, category, tags, authors etc.
= Version 1.9.5 (2019-01-08) = * [+] New: Added gutenberg block support for shortcodes - Posts Follow Button, Terms Follow button, Authors Follow button, Posts I Follow, Authors I Follow and Terms I Follow. = Version 1.9.4 (2018-12-27) = * [+] New: Added a compatibility with WordPress 5.0 = Version 1.9.3 (2018-11-17) = * [+] New: Added some action and filters in email templates. = Version 1.9.2 (2018-08-09) = * [*] Fix: Fixed buddypress profile image not sync with listing user profile image. * [*] Fix: Fixed an issue with author followers listing in buddypress. * [*] Fix: Fixed term widget issue. = Version 1.9.1 (2018-07-25) = * [*] Fix: Fixed PHP deprecated errors and string translation issues. = Version 1.9.0 (2018-06-13) = * [+] New: Added custom CSS option. * [+] New: Added widget for Post Follow , Term Follow and Author Follow button. * [+] New: Added BuddyPress support. * [+] New: Added export followers features.
See full change log here