enter code here

$customer_id = $customerSession->getCustomer()->getId();

if(count($order_Collection)>0)
                 {

                     foreach($order_Collection as $order)
                    {
                     $LastOrderDate = $order->getCreatedAt();
                    }

                  $LastOrder = strtotime($LastOrderDate);
                   $NextTime = date("Y-m-d H:i:s", strtotime('-1 hours'));
                  $CheckTime = strtotime($NextTime);
                  $objectManager = MagentoFrameworkAppObjectManager::getInstance();
                  $cart = $objectManager->get('MagentoCheckoutModelCart')->getQuote();
                  $subTotal = $cart->getSubtotal();
                  $store  =  $cart->getStoreId();
                  $carriers = $objectManager->get('MagentoFrameworkAppConfigScopeConfigInterface')->getValue('carriers');

                  if($LastOrder>=$CheckTime && $subTotal<=250)
                  {
                    $hiddenMethodCode   = 'freeshipping';

                     foreach ($carriers as $carrierCode => $carrierConfig)
                    {
                         $hiddenMethodCode   = 'freeshipping';
                       if( $carrierCode !=  $hiddenMethodCode)
                        {

                          //  $store->saveConfig("carriers/{$carrierCode}/active", '0');

                             $objectManager = MagentoFrameworkAppObjectManager::getInstance(); // Instance of object manager
                          $resource = $objectManager->get('MagentoFrameworkAppResourceConnection');
                          $connection = $resource->getConnection();
                          $tableName = $resource->getTableName('core_config_data'); //gives table name with prefix

                          //Update Data into table
                          $sql = "Update " . $tableName . " Set  value= 0 where path='carriers/{$carrierCode}/active'";

                         // print_r($sql);
                          $connection->query($sql);
                        }
                    }
                  }else{   // < 72 && > 250

                     $objectManager = MagentoFrameworkAppObjectManager::getInstance();
                  $cart = $objectManager->get('MagentoCheckoutModelCart')->getQuote();
                  $subTotal = $cart->getSubtotal();
                  $store  =  $cart->getStoreId();
                  $carriers = $objectManager->get('MagentoFrameworkAppConfigScopeConfigInterface')->getValue('carriers');

                      $hiddenMethodCode   = 'freeshipping';

                      foreach ($carriers as $carrierCode => $carrierConfig)
                      {
                        if( $carrierCode ==  $hiddenMethodCode)
                        {

                          $objectManager = MagentoFrameworkAppObjectManager::getInstance(); // Instance of object manager
                          $resource = $objectManager->get('MagentoFrameworkAppResourceConnection');
                          $connection = $resource->getConnection();
                          $tableName = $resource->getTableName('core_config_data'); //gives table name with prefix

                          //Update Data into table
                          $sql = "Update " . $tableName . " Set  value= 0 where path='carriers/{$carrierCode}/active'";

                           $connection->query($sql);
                         }
                      }
                    }

                   }else{

                  $objectManager = MagentoFrameworkAppObjectManager::getInstance();
                  $cart = $objectManager->get('MagentoCheckoutModelCart')->getQuote();
                  $subTotal = $cart->getSubtotal();
                  $store  =  $cart->getStoreId();
                  $carriers = $objectManager->get('MagentoFrameworkAppConfigScopeConfigInterface')->getValue('carriers');

                          $hiddenMethodCode   = 'freeshipping';

                          foreach ($carriers as $carrierCode => $carrierConfig)
                          {
                            if( $carrierCode ==  $hiddenMethodCode)
                            {

                          //  $store->saveConfig("carriers/{$carrierCode}/active", '0');

                          $objectManager = MagentoFrameworkAppObjectManager::getInstance(); // Instance of object manager
                          $resource = $objectManager->get('MagentoFrameworkAppResourceConnection');
                          $connection = $resource->getConnection();
                          $tableName = $resource->getTableName('core_config_data'); //gives table name with prefix

                          //Update Data into table
                          $sql = "Update " . $tableName . " Set  value= 0 where path='carriers/{$carrierCode}/active'";

                         // print_r($sql);
                          $connection->query($sql);
                            }
                          }
                        }

                }