Build a Nook shop → settle in three new islanders → set up a residential center → set up a campsite to invite small animals to stay → set up a clothing store → send you an application for KK concert.
When the main line of the game enters a certain stage, you will meet raccoons and send you messages. In order to make our uninhabited island more popular, you need to invite the famous singer K.K. to give a concert on the island. What you have to do, of course, is to attract K.K. to give a concert on the island.
Meanwhile, you will unlock the island rating system in Shi Hui, Xi, and talk with Shi Hui, Xi. You can know your current island rating. If the rating reaches three stars, you can invite K.K. to hold a concert on the island and you can build an island.