Keep Limit for Guest Customer Coupon Usage

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<?php

\Magento\Framework\Component\ComponentRegistrar::register(
    \Magento\Framework\Component\ComponentRegistrar::MODULE,
    'NameSpace_SalesRule',
    __DIR__
);

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">

    <module name="NameSpace_SalesRule" setup_version="1.0.0">
        <sequence>
            <module name="Magento_SalesRule"/>
        </sequence>
    </module>
</config>

Now create etc/db_schema.xml

<?xml version="1.0"?>

<schema xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Setup/Declaration/Schema/etc/schema.xsd">
       
    <table name="salesrule_guest" resource="default" engine="innodb" comment="Salesrule Guest">
        <column xsi:type="int" name="rule_guest_id" padding="10" unsigned="true" nullable="false" identity="true"
                comment="Rule Guest Id"/>
        <column xsi:type="int" name="rule_id" padding="10" unsigned="true" nullable="false" identity="false" default="0"
                comment="Rule ID"/>
        <column xsi:type="varchar" name="customer_email"  nullable="true"
                 comment="Customer Email"/>
        <column xsi:type="smallint" name="times_used" padding="5" unsigned="true" nullable="false" identity="false"
                default="0" comment="Times Used"/>
        <constraint xsi:type="primary" referenceId="PRIMARY">
            <column name="rule_guest_id"/>
        </constraint>
        <index referenceId="SALESRULE_CUSTOMER_RULE_ID_CUSTOMER_EMAIL" indexType="btree">
            <column name="rule_id"/>
            <column name="customer_email"/>
        </index>
        <index referenceId="SALESRULE_CUSTOMER_CUSTOMER_EMAIL_RULE_ID" indexType="btree">
            <column name="customer_email"/>
            <column name="rule_id"/>
        </index>
    </table>
</schema>

Create Module File Model\Rule\Guest.php

<?php

 
namespace NameSpace\SalesRule\Model\Rule;

 
class Guest extends \Magento\Framework\Model\AbstractModel
{
    /**
     * Constructor
     *
     * @return void
     */
    protected function _construct()
    {
        parent::_construct();
        $this->_init(\NameSpace\SalesRule\Model\ResourceModel\Rule\Guest::class);
    }
    /**
     * Load by customer rule
     *
     * @param int $customerId
     * @param int $ruleId
     * @return $this
     */
    public function loadByGuestRule($customerEmail, $ruleId)
    {
        $this->_getResource()->loadByGuestRule($this, $customerEmail, $ruleId);
        return $this;
    }
}

Create ResourceModel File Model\ResourceModel\Rule\Guest.php

<?php

 amespace NameSpace\SalesRule\Model\ResourceModel\Rule;

 
class Guest extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
{
    /**
     * Constructor
     *
     * @return void
     */
    protected function _construct()
    {
        $this->_init('salesrule_guest', 'rule_guest_id');
    }
 
    public function loadByGuestRule($rule, $customerEmail, $ruleId)
    {
        $connection = $this->getConnection();
        $select = $connection->select()->from(
            $this->getMainTable()
        )->where(
            'customer_email = :customer_email'
        )->where(
            'rule_id = :rule_id'
        );
        $data = $connection->fetchRow($select, [':rule_id' => $ruleId, ':customer_email' => $customerEmail]);
        if (false === $data) {
            // set empty data, as an existing rule object might be used
            $data = [];
        }
        $rule->setData($data);
        return $this;
    }
}

Create Collection File Model\ResourceModel\Rule\Guest\Collection.php

<?php

 
namespace NameSpace\SalesRule\Model\ResourceModel\Rule\Guest;

 
class Collection extends \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection
{
    /**
     * Collection constructor
     *
     * @return void
     */
    protected function _construct()
    {
        parent::_construct();
        $this->_init(
            \NameSpace\SalesRule\Model\Rule\Guest::class,
            \NameSpace\SalesRule\Model\ResourceModel\Rule\Guest::class
        );
    }
}

Now create after Plugin for canProcessRule() function 

of Magento\SalesRule\Model\Utility with name like Plugin/UtilityPlugin.php 

<?php

namespace NameSpace\SalesRule\Plugin;

use Magento\SalesRule\Model\Utility;

/**
 * Plugin For Utility
 */
class UtilityPlugin
{
   
    /**
     * @var OrderCollectionFactory
     */
    protected $ruleGuestFactory;
    /**
     * UtilityPlugin constructor.
     * @param Request $request
     */
    public function __construct(        
        \NameSpace\SalesRule\Model\Rule\GuestFactory $ruleGuestFactory
    ) {
        
        $$this->ruleGuestFactory = $ruleGuestFactory;
    }
    
     
    public function afterCanProcessRule(Utility $subject, $result, $rule, $address)
    {
        if($result == false) {
            return $result;
        }
        
 */
      $ruleId = $rule->getId();
      if ($ruleId && $rule->getUsesPerCustomer()) {
          $customerEmail = $address->getQuote()->getCustomerEmail();
           /** @var \NameSpace\SalesRule\Model\Rule\Guest $ruleGuest */
          $ruleGuest = $this->ruleGuestFactory->create();
          $ruleGuest->loadByGuestRule($customerEmail, $ruleId);
          if ($ruleGuest->getId()) {
              if ($ruleGuest->getTimesUsed() >= $rule->getUsesPerCustomer()) {
                 $rule->setIsValidForAddress($address, false);
                 return false;
              }
          }
        return $result;
      }

    }

}//end class  

Hope It will work for you

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