Here is the fragment again:
You correctly identified the fragment as an afterthought phrase. Including, the transition that begins the fragment, is the clue.
To fix this fragment, you can modify the information so that you have a main clause. The sentence would look like this:
Or you could use Punctuation Rule 7:
Main Clause + , + Afterthought Transition + Ø + Details.
The correction would look like this:
Enjoy the respect that you have earned in the kingdom!