Freeshipping

I solved it by pasting this code into child theme’s functions.php file. It sets the shipping fees for all shipping methods to 0.

function filter_woocommerce_package_rates( $rates, $package ) {
    // Cart total amount (integer)
    $cart_total = WC()->cart->cart_contents_total;

    // Greater than or equal to
    if ( $cart_total >= 59.99 ) {
        foreach ( $rates as $rate_key => $rate ) {
            // For "free shipping" method (enabled), remove it
            if ( $rate->method_id == 'free_shipping' ) {
                unset( $rates[$rate_key] );
            // For other shipping methods
            } else {
                // Append rate label titles (free)
                $rates[$rate_key]->label .= ' ' . __( '(free)', 'woocommerce' );

                // Set rate cost
                $rates[$rate_key]->cost = 0;

                // Set taxes rate cost (if enabled)
                $taxes = array();

                foreach ( $rates[$rate_key]->taxes as $key => $tax ) {
                    if ( $rates[$rate_key]->taxes[$key] > 0 ) {
                        $taxes[$key] = 0;
                    }
                }

                $rates[$rate_key]->taxes = $taxes;
            }
        }
    }

    return $rates;
}
add_filter( 'woocommerce_package_rates','filter_woocommerce_package_rates', 10, 2 );