Hi Offerbabaz,

Thanks for the details.

In the Product (grid or carousel) widget, you should choose Related Products data source https://prnt.sc/LZ4ljkgSdIul. Make sure products are share SAME categories or tags.

You can read more about Related Products here https://woocommerce.com/document/related-products-up-sells-and-cross-sells/#section-3

Regards,