The recommended item level is 460, however, depending on how you intend on acquiring the island token, you might want to level up even more before tackling this specific token. This is obviously only recommended, and you're simply free to attempt the area before being greater than 460; although it may take more attempts.
Isle Of Yearning
The Isle of Yearning is found in the western area of the map. It is past the Wall of Procyon so you will have to have unlocked Rohendel to visit here. It will be a little island within the Sea of Heavens, East of Feiton. This island is renowned for its double RNG meaning Random Number Generator. This obviously has a deeper meaning and it is meant for not only numbers, for instance in this game, but it also represents the random drops of loot. Luckily this island can be obtained all the time, so there is no need to make use of the timer app within the menu to alert you if this spawns. Buying Lost ark Gold can help boost your gear in Lost ark, which benefits physical damage dealers and specs that benefit from scaling.
Retrieving The Island Token
It is recommended to possess a party along with a high item level to attain the area token more quicker. The RNG with this island has been said to be the hardest to get the token. The enemies throughout this island called Slow Turtle Captain possess a chance of dropping the Setino's Secret Bag. This bag is a random drop and it is rare. The second part of acquiring the island token comes whenever you open this secret bag as it includes a chance of dropping the area's soul. This is a random drop inside a random drop that might take some grinding to obtain.
There are two possible spawn points for that Slow Turtle Captain which are the right side of the area and the bottom left part of the area. This is why it's wise to possess a party or join an event as you can separate and camp at both locations. Since the party will share the rewards, it might be beneficial as possible to go through more Slow Turtle Captains, ultimately upping your chances with this rare drop. The respawn time with this monster is roughly 45 seconds.
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