/**
 * @snippet       $$$ remaining to Free Shipping @ WooCommerce Cart
 * @how-to        Get CustomizeWoo.com FREE
 * @author        Rodolfo Melogli
 * @compatible    WooCommerce 3.9
 * @donate $9     https://businessbloomer.com/bloomer-armada/
 */
 
add_action( 'woocommerce_before_cart', 'bbloomer_free_shipping_cart_notice' );
  
function bbloomer_free_shipping_cart_notice() {
  
   $min_amount = 50; //change this to your free shipping threshold
   
   $current = WC()->cart->subtotal;
  
   if ( $current < $min_amount ) {
      $added_text = 'Get free shipping if you order ' . wc_price( $min_amount - $current ) . ' more!';
      $return_to = wc_get_page_permalink( 'shop' );
      $notice = sprintf( '%s %s', esc_url( $return_to ), 'Continue Shopping', $added_text );
      wc_print_notice( $notice, 'notice' );
   }
  
}