Couldn’t see an armoury page for your Crusader on EU or US so, on the assumption you’re playing this…
I’d actually suggest re-rolling the All Resist to 20% Holy, as that will give you the most damage increase. You’ll also get more damage / armour as you can spend the equivalent of 10% Movement Speed in your Paragon Points into Strength instead. If it’s not the Heaven’s Fury build, re-roll the amulet to whichever element your build’s main attack is.
Long term though, you’re going to need a much better amulet than this one. I reforged over 400 times this season to get the one I have on my Barb now.