I'm searching for a solution where it makes it very visual that if you buy ten of a product you gets a discount.
You can use Magento out-of-the-box to create a promotion that assigns a discount if the customer is buying 10 or more products.
Here you can read more about promotions in Magento 2:
If you need a promo rule, then you can use the feature that is available in M2 out-of-the-box, as mentioned above.
However, if you need to highlight your offer and make it more prominent, you can use Promo Banners.