Uncheck "My Billing address is the same as my Delivery address"

Add a jQuery CDN link to the header script of the checkout page (Admin panel > storefront > Script Manager)

Then add the below script to the footer script of the checkout page (Admin panel > Storefront > Script Manager)

<script type="text/javascript">
    (function($) {
        var timer = setInterval(function() {
            if ($('#sameAsBilling').length) {
                clearInterval(timer);
                setTimeout(function() {
                    $('[for="sameAsBilling"]').click();
                    $('#sameAsBilling').prop('checked', false).removeAttr('checked').attr('value','false');
                }, 500);
            }
        }, 200);
    })(jQuery);
</script>