When creating the dinosaurs found in Jurassic Park, John Hammond spared no expense in making sure the newborns had the perfect environment to grow up in. To accomplish this goal, Hammond purchased a second island called Isla Sorna, which was used solely for research and to raise newborns before sending them off to Jurassic Park. What Hammond couldn't have expected was that this second island could be the perfect way to save the remaining dinosaurs after the destruction of Isla Nublar in Jurassic World: Fallen Kingdom.
Isla Sorna was first introduced in The Lost World: Jurassic Park and audiences could see dinosaurs roaming in the wild, free of fences. While there weren't any systems to fail them like in the first film, the humans had to contend with all new problems. The primary one being the rigors of surviving on an island where dinosaurs had territories and hunted regularly. Jurassic Park III dug deeper into Isla Sorna's activities, revealing that it's where InGen conducted genetic research on new dinosaurs while raising the newborns.
Since Isla Nublar's destruction following the eruption of Mount Sibo, the surviving dinosaurs have been bought and sold by rival companies and countries who want to wield the same genetic power Hammond did decades ago. Those that never made it to the auction were released into the United States, taking over national parks and suburban neighborhoods. Right now, nothing is policing these creatures or the humans they are interacting with. There is a strong need for these creatures to return to an environment where they can live away from the dangers of humans.
With no mention of Isla Sorna since the third film, it's possible that the island still isn't affected by humans, meaning the dinosaurs that live on it are thriving. With an order in place and a community amongst the dinosaurs established, Isla Sorna will be the best place for these refugee dinosaurs to call home. Over the decades, it has been established that the carnivores are in the island interior while the herbivores remain on the outside perimeter. This means that as the dinosaurs are dropped off on the island, rescue workers can pinpoint the exact hunting grounds their species operates in and lower the risk of attacks to the new additions and themselves.
Another benefit of the island is its restricted status between the United States and the Costa Rican governments. Since the events of The Lost World, venturing into the island is now considered an offense. With the dinosaurs being protected under the laws of two governments, they can be allowed to live freely and flourish with their own species. Integrating the new dinosaurs will also boost the population and increase each species' lifespan.
As the world of Jurassic Park continues to change, with dinosaurs living alongside humans, there is still hope for these creatures to survive potential extinction. Right now, the best way for that to happen is to collect and transport as many dinosaurs as possible to the protected Isla Sorna. The location will bolster the populations of many species and save those left out in humanity following their escape in Jurassic World: Fallen Kingdom.