izyim/app/Providers/EventServiceProvider.php

<?php

namespace App\Providers;

use App\Events\Accounts\UserEvent;
use App\Listeners\Accounts\UserEventHandler;
use Illuminate\Foundation\Support\Providers\EventServiceProvider as ServiceProvider;

class EventServiceProvider extends ServiceProvider
{
    /** @var array */
    protected $listen = [
        UserEvent::class => [UserEventHandler::class]
    ];
}