The Cart Page Featured Collection block provides a built-in option to cross-sell products on the cart page.
Add the Block to the Cart Page Template
In the theme editor (Customize), open the page selector to select Cart.
Once the template has loaded, select (+) Add Featured collection below Cart page in the left sidebar.
Customize the Block
Click the block to open its settings.
Include a heading
Add a Heading for the block using the provided text field.
Show collection description
To include the collection's description (configured in the Products admin) with the block, select to enable Show collection description.
Select collection
Click Select collection to locate the collection to feature.
Choose a layout
Select either Slider or Grid to select a Collection layout.
Adjust product grid
Use the Products per row and Limit products to customize the product grid within the block.