Clear player effects/reset health when in specific world

I am working on a plugin that clears a player's effects and resets their health upon entering a specific world, the server's lobby. Here's my attempt to far, but to no avail. Maybe I need to place it under a different function than onJoin()? I just want to make it so that whenever a player enters a world, their health and effects are reset. Any help would be greatly appreciated.

PHP:

public function onJoin(PlayerJoinEvent $event) {
        $player = $event->getPlayer();
        $this->onItem($player);
        if($player->getLevel()->getName() === "Lobby"){
            $player->removeAllEffects();
            $player = $event->getPlayer();
            $player->getArmorInventory()->clearAll();
            $player->setHealth(20);
            $player->setFood(20);
            $player->setGamemode(0);
            $player->removeAllEffects(true);
        }
    }

 

use EntityLevelChangeEvent, ensure $event->getEntity() is player and check that $event->getTarget() is the world you want

 

Awesome, thanks for the help!