IT IS HIGHLY RECOMMENDED TO START A NEW GAME (HARD MODE) This will save all inventory items. Then you can lower the difficulty.
Better to choose Strider. Then you can change to another.
Almost everything that could be obtained on the island was obtained.
Gold 220k +, Crystals 32k +, Statuette x17, Resurrection stone x1 and x9 shards, Items for cleaning level 1,2,3, total x37 and other little things.