Sorry I posted this on WoW Classic and not SoD! Apologies.
I don’t know why it had to come to this, but make un’goro power crystals 1 color, black or white or grey. When you pick it up, it has a 25% chance to be one of the 4 colors (red, blue, green, or yellow) in your bag.
This current system of farmers, newbs, and bots picking all the blue and yellow and leaving THE ENTIRE MAP 100% red and green crystals serves no one and trolls the rest. They are not smart enough to pick the red and green so it can respawn, they just circle the map 100x times in 2 hours to pick 1 blue. Why is this allowed? Can you do anything about the bots and gold farmers?