Could you maybe be more specific about what you want to suggest? I'm guessing that you don't really know how to delete your island. Well, that's just fine, we're here to help you! First, something important that you should keep in mind, you can only delete your co-op profiles and not your solo profile.
If you want to delete the co-op profile, please follow these steps:
Open Skyblock Menu —> Profile Menu —> Select the co-op profile —> Delete Profile
I hope this answers your 'question' so to say. If this really is an suggestion then you could try to put more information in it so it get's more clear for everyone