You have to override this file:
\app\design\frontend\kiss\luma\Magento_Catalog\templates\product\price\final_price.phtml
Overridden code is here:
<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
// @codingStandardsIgnoreFile
?>
<?php
/** @var \Magento\Catalog\Pricing\Render\FinalPriceBox $block */
/** ex: \Magento\Catalog\Pricing\Price\RegularPrice */
/** @var \Magento\Framework\Pricing\Price\PriceInterface $priceModel */
$priceModel = $block->getPriceType('regular_price');
/** ex: \Magento\Catalog\Pricing\Price\FinalPrice */
/** @var \Magento\Framework\Pricing\Price\PriceInterface $finalPriceModel */
$finalPriceModel = $block->getPriceType('final_price');
$idSuffix = $block->getIdSuffix() ? $block->getIdSuffix() : '';
$schema = ($block->getZone() == 'item_view') ? true : false;
?>
<?php if ($block->hasSpecialPrice()): ?>
<span class="old-price">
<?php /* @escapeNotVerified */ echo $block->renderAmount($priceModel->getAmount(), [
'display_label' => __('Regular Price'),
'price_id' => $block->getPriceId('old-price-' . $idSuffix),
'price_type' => 'oldPrice',
'include_container' => true,
'skip_adjustments' => true
]); ?>
</span>
<span class="special-price">
<?php /* @escapeNotVerified */ echo $block->renderAmount($finalPriceModel->getAmount(), [
'display_label' => __('Special Price'),
'price_id' => $block->getPriceId('product-price-' . $idSuffix),
'price_type' => 'finalPrice',
'include_container' => true,
'schema' => $schema
]); ?>
</span>
<?php else: ?>
<?php /* @escapeNotVerified */ echo $block->renderAmount($finalPriceModel->getAmount(), [
'price_id' => $block->getPriceId('product-price-' . $idSuffix),
'price_type' => 'finalPrice',
'include_container' => true,
'schema' => $schema
]); ?>
<?php endif; ?>
<?php if ($block->showMinimalPrice()): ?>
<?php if ($block->getUseLinkForAsLowAs()):?>
<a href="<?= /* @escapeNotVerified */ $block->getSaleableItem()->getProductUrl() ?>" class="minimal-price-link">
<?= /* @escapeNotVerified */ $block->renderAmountMinimal() ?>
</a>
<?php else:?>
<span class="minimal-price-link">
<?= /* @escapeNotVerified */ $block->renderAmountMinimal() ?>
</span>
<?php endif?>
<?php endif; ?>
All this tested in my fresh setup, Also adding image here please check

Have updated file path as per your theme package please check.