Magento 2 convert registered customer order to guest order after placing order

create the event.xml on your module under the Vendor/Module/etc/event.xml and add the below code

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
    <event name="checkout_submit_all_after">
        <observer name="checkout_order_place_after" instance="Vendor\Module\Observer\PlaceAfter" />
    </event>
</config>

<?xml version="1.0"?>

</event>

</config>

create the PlaceAfter.php on your module under the Vendor/Module/Observer/PlaceAfter.php and add the below code

<?php

namespace Vendor\Module\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\Event\Observer as EventObserver;
use Psr\Log\LoggerInterface;
use Magento\Sales\Api\OrderRepositoryInterface;


class PlaceAfter implements ObserverInterface
{

    protected $_customerSession;
    /**
     * @var OrderRepositoryInterface
     */
    protected $orderRepository;
    /**
     * @var LoggerInterface
     */
    protected $logger;
    /**
     * @var \Magento\Sales\Model\OrderFactory
     */
    protected $orderModel;
    /**
     * @var \Magento\Sales\Model\Order\Email\Sender\OrderSender
     */
    protected $orderSender;

    /**
     * @param \Magento\Sales\Model\OrderFactory $orderModel
     * @param \Magento\Sales\Model\Order\Email\Sender\OrderSender $orderSender
     * @param \Magento\Checkout\Model\Session $checkoutSession
     *
     * @codeCoverageIgnore
     */
    public function __construct(
        \Magento\Sales\Model\OrderFactory $orderModel,
        LoggerInterface $logger,
        \Magento\Sales\Model\Order\Email\Sender\OrderSender $orderSender,
        \Magento\Customer\Model\Session $customerSession,
        OrderRepositoryInterface $orderRepository,
        \Magento\Sales\Api\Data\OrderInterface $orderData
    )
    {
        $this->logger = $logger;
        $this->orderModel = $orderModel;
        $this->orderSender = $orderSender;
        $this->_customerSession = $customerSession;
        $this->orderRepository = $orderRepository;
        $this->orderData = $orderData;
    }

    /**
     * @param \Magento\Framework\Event\Observer $observer
     * @return void
     */
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $order = $observer->getEvent()->getOrder();
        $orderId = $order->getEntityId();
        $this->logger->info(print_r($orderId,true));
        $guestemail = "test@gmail.com";
        
        $comment = sprintf(
            __("%s customer order converted to : %s guest user"),
            $order->getCustomerEmail(),$guestemail
        );
        $order->addStatusHistoryComment($comment);
        $order->setCustomerId(null);
        $order->setCustomerIsGuest(1);
        $order->setCustomerEmail($guestemail);
        $this->orderRepository->save($order);

        $order->setCanSendNewEmailFlag(true);
        $order->save();
        $this->_customerSession->setForceOrderMailSentOnSuccess(true);
        $this->orderSender->send($order);
        
        return $this;
    }
}

<?php

namespace Vendor\Module\Observer;

use Magento\Framework\Event\ObserverInterface;

use Magento\Framework\Event\Observer as EventObserver;

use Psr\Log\LoggerInterface;

use Magento\Sales\Api\OrderRepositoryInterface;

class PlaceAfter implements ObserverInterface

{

protected $_customerSession;

/**

* @var OrderRepositoryInterface

protected $orderRepository;

/**

* @var LoggerInterface

protected $logger;

/**

* @var \Magento\Sales\Model\OrderFactory

protected $orderModel;

/**

* @var \Magento\Sales\Model\Order\Email\Sender\OrderSender

protected $orderSender;

/**

* @param \Magento\Sales\Model\OrderFactory $orderModel

* @param \Magento\Sales\Model\Order\Email\Sender\OrderSender $orderSender

* @param \Magento\Checkout\Model\Session $checkoutSession

* @codeCoverageIgnore

public function __construct(

\Magento\Sales\Model\OrderFactory $orderModel,

LoggerInterface $logger,

\Magento\Sales\Model\Order\Email\Sender\OrderSender $orderSender,

\Magento\Customer\Model\Session $customerSession,

OrderRepositoryInterface $orderRepository,

\Magento\Sales\Api\Data\OrderInterface $orderData

)

{

$this->logger = $logger;

$this->orderModel = $orderModel;

$this->orderSender = $orderSender;

$this->_customerSession = $customerSession;

$this->orderRepository = $orderRepository;

$this->orderData = $orderData;

}

/**

* @param \Magento\Framework\Event\Observer $observer

* @return void

public function execute(\Magento\Framework\Event\Observer $observer)

{

$order = $observer->getEvent()->getOrder();

$orderId = $order->getEntityId();

$this->logger->info(print_r($orderId,true));

$guestemail = "test@gmail.com";

$comment = sprintf(

__("%s customer order converted to : %s guest user"),

$order->getCustomerEmail(),$guestemail

);

$order->addStatusHistoryComment($comment);

$order->setCustomerId(null);

$order->setCustomerIsGuest(1);

$order->setCustomerEmail($guestemail);

$this->orderRepository->save($order);

$order->setCanSendNewEmailFlag(true);

$order->save();

$this->_customerSession->setForceOrderMailSentOnSuccess(true);

$this->orderSender->send($order);

return $this;

}

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