Anything that creates opportunity attacks will create more opportunities to use Sentinel. As mentioned in the vampire battle, fighter Battlemaster subclass maneuvers like Swing maneuver and Riposte maneuver can be used to maximize or created opportunity attacks. The Mage Slayer feat can create opportunity attacks but it does not combine well with Sentinel. The reason is that wizards and other casters are primarily long-range fighters. There’s no point in reducing a wizard’s movement to zero if they can kill from 100 feet away with a Fireball.