WooCommerce Price Drops is a plugin and excellent marketing tool which allows you to lower (or raise) price of a product over time in steps say $10 every hour. This way you can get more buyers and make them spend more time on your site waiting for the lowest price they are willing to pay for a product. With this marketing tool, you will be able to increase sales, get more satisfied buyers, upsell more related products and increase the average time visitors spend on your webshop. Please read the documentation.
WooCommerce Drop / Raise Prices Overview and Features:

WordPress 5.2+ ready and WooCommerce 2.6+ & 3.6+ ready
Seamless integration into WooCommerce via its hooks
Choose between price rise or drop
Percentage or fixed value price rise or drop
Set price increment / decrement
Set minimal/maximal price
Set how often the price will drop or raise
Show counter for next price drop/raise on single product page
Set drop/rise price timeframe – price will change from date to date and stop
Reset price raise/drop after a completed order
Cronjobs required – if your host does not support 1-minute cronjobs you can use 3rd party cron service like easycron