I know this is a weird thing to say, but
If the Jurassic Park area has to be closed at some point, it better be closed the right way.
I'm saying, there better be a whole plan behind it.
Universal wouldn't tell the visitors that it was closing, instead, on closing day, there would be several raptors that would get out, disobeying the trainer and then going around to visitors and jumpscaring them, and then going after a few trained actors, biting them and taking them down, with the special effects and all. Over the speakers, alarms would play and people would be prompted to get out of the area immediately, and they would do so, and the gates of Jurassic Park would be closed, and right as the doors are near getting shut, a loud crunch, several wires snapping and loud thumps can be heard from the area of where the ride is, and a loud Spinosaurus roar, and a T-Rex roar. The employees at Jurassic Park would then yell that there had been a containment breach, and stop the gates, running inside as when they get in, the gates would shut, permanently.
Perfect way to go.