Here’s a neat little trick in case you don’t already know it: If you block someone and then unblock them, you can get them to stop following you.
I call it bucking :)
So, if you want to try and avoid all the drama that comes with blocking and just don’t want someone to keep following you and commenting on your stuff, trying bucking before blocking. And if they’re persistent, you can always block and/or report for harassment, etc.