How are you allowed to write articles for a living? There's a Save Data Transfer tool in the eShop called the Island Transfer Tool that allows you to import your island from Switch to Switch. Even if you didn't know that, calling Nintendo Support would have informed you the same thing. I'm glad you have to restart due to your lack of negligence lmao.
Oof. That must be terribly disheartening and frustrating; you have my sympathies.
I have no idea why the Switch's data transfer is so limited. One would think Nintendo could simply implement some kind of all-in-one function to transfer all game, user, and save data to a new console.