WOOCS - WooCommerce Currency Switcher

• open index.php of the plugin
• find public function raw_woocommerce_price($price)
• on the same end of this function replace:

  return $price;

  to:

  if (($price <= 1000)) {
          $price = round($price / 1000, 0) * 1000;
          return $price;
   }
  else {
          $price = ceil($price / 500) * 500 ;
          return $price;
  }

   

Also you can try to use this hook: https://currency-switcher.com/hook/woocs_raw_woocommerce_price/