good potential, but rpg skill like logic ruins it for me. It could be written without the game system like:
"MC study and have knowledge about it from is past life and prince. finds out that there are good itens hidden in the island cave, while the remaining part of island doesnt show promise. making this a rich place that wrongly appraised. his knowledge about rocks could save the goblins and his caring personality gains their trust.
with the skill system is just a pathetic MC whose luck is the cheating crest ..."
This new habit of using game system is good to explain the rules in the world fast, but if abused make the mc weak and just a luck bastard.