Another how do I fix unset jelly

This is the recipe I used, except I only used serrano peppers. The jelly is thick, but only about half set after 24 hours. I refrigerated it as well to see if that would kick it into setting. What’s the best method for me to get it to set?

Christmas Hot Pepper Jelly

* 1 cup Serrano peppers Cored and minced
* 1 cup Red bell pepper Cored and minced
* 1.5 cups Apple cider vinegar
* 6 cups sugar
* 4 tablespoons Powdered pectin folded into sugar
* I added: 1 tablespoon of lime juice

by RatherNerdy