First thing you need to do is install and activate the Remove Nofollow plugin. Upon activation, you need to visit Settings » Remove Nofollow to configure plugin settings. Remove Nofollow plugin allows you to remove nofollow from entire comments or just from comment author link. You can also dofollow both options.
For More Information Please Refer: https://www.wpbeginner.com/wp-tutorials/how-to-remove-nofollow-from-wordpress-comments/