To lure and entice these high-potential players, you need to introduce them to a benefit that they are not already enjoying on the platform they use.
Even after luring most of those high-potential players will continue to use the platform that they already use. They're much happy with the platform/s that they use and it's really a tough job to convince them or to lure them to switch to another platform.
Unless casino give more to them so they will try. Usually, casinos know what they should do to attract and lure their attention. If those people have already joined a casino, they can send an email promotion to give them a chance to test their services. This can make them curious about how good the casino services so that will give them to learn what benefits they will get if they stay in the casino.
If those people can feel the benefit, they will return to that casino and will use the other feature to know more. That will help casinos to gain benefit from them.