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app/code/Magento/Catalog/Block/Product/ProductList/Related.php

@@ -117,7 +117,7 @@ class Related extends AbstractProduct implements IdentityInterface
             $collection->addCategoriesFilter(['in' => $product->getCategoryIds()]);
             $collection->setVisibility($this->_catalogProductVisibility->getVisibleInCatalogIds());
             $collection->getSelect()->order('rand()');
-            $collection->setPageSize(6);
+            $collection->setPageSize(10);
             $collection->addStoreFilter($product->getStoreId());
             $this->_itemCollection =  $collection;
         }

app/code/Magento/Catalog/Block/Product/ProductList/Upsell.php

@@ -16,6 +16,7 @@ use Magento\Checkout\Model\Session as CheckoutSession;
 use Magento\Framework\DataObject;
 use Magento\Framework\DataObject\IdentityInterface;
 use Magento\Framework\Module\Manager;
+use Magento\Reports\Model\ResourceModel\Product\CollectionFactory;
 
 /**
  * Catalog product upsell items block
@@ -27,6 +28,11 @@ use Magento\Framework\Module\Manager;
 class Upsell extends AbstractProduct implements IdentityInterface
 {
     /**
+     * @var Collection
+     */
+    protected $_collectionFactory;
+
+    /**
      * @var int
      */
     protected $_columnCount = 4;
@@ -86,8 +92,10 @@ class Upsell extends AbstractProduct implements IdentityInterface
         ProductVisibility $catalogProductVisibility,
         CheckoutSession $checkoutSession,
         Manager $moduleManager,
+        CollectionFactory $collectionFactory,
         array $data = []
     ) {
+        $this->_collectionFactory = $collectionFactory;
         $this->_checkoutCart = $checkoutCart;
         $this->_catalogProductVisibility = $catalogProductVisibility;
         $this->_checkoutSession = $checkoutSession;
@@ -120,6 +128,18 @@ class Upsell extends AbstractProduct implements IdentityInterface
             ['product' => $product, 'collection' => $this->_itemCollection, 'limit' => null]
         );
 
+        if (!count($this->_itemCollection->getItems())){
+            $collection = $this->_collectionFactory->create();
+            $collection->addAttributeToSelect('*');
+            $collection->addCategoriesFilter(['not in' => $product->getCategoryIds()]);
+            $collection->setVisibility($this->_catalogProductVisibility->getVisibleInCatalogIds());
+            $collection->getSelect()->order('rand()');
+            $collection->setPageSize(10);
+            $collection->addStoreFilter($product->getStoreId());
+            $this->_itemCollection =  $collection;
+
+        }
+
         foreach ($this->_itemCollection as $product) {
             $product->setDoNotUseCategoryId(true);
         }