Change the Continue Shopping link on the WooCommerce Cart page

shopping-redirect.php

<?php
/**
 * Return the permalink of the shop page for the continue shopping redirect filter
 *
 * @param  string $return_to
 * @return string
 */
function my_woocommerce_continue_shopping_redirect( $return_to ) {
	return get_permalink( wc_get_page_id( 'shop' ) );
}
add_filter( 'woocommerce_continue_shopping_redirect', 'my_woocommerce_continue_shopping_redirect', 20 );