ctrlpanel/app/Listeners/UnsuspendServers.php

<?php

namespace App\Listeners;

use App\Events\UserUpdateCreditsEvent;
use App\Models\Server;
use Exception;
use Illuminate\Contracts\Queue\ShouldQueue;

class UnsuspendServers implements ShouldQueue
{
    /**
     * Handle the event.
     *
     * @param  UserUpdateCreditsEvent  $event
     * @return void
     *
     * @throws Exception
     */
    public function handle(UserUpdateCreditsEvent $event)
    {
        if ($event->user->credits > config('SETTINGS::USER:MINIMUM_REQUIRED_CREDITS_TO_MAKE_SERVER', 50)) {
            /** @var Server $server */
            foreach ($event->user->servers as $server) {
                if ($server->isSuspended()) {
                    $server->unSuspend();
                }
            }
        }
    }
}