I learned that I am no longer allowed to cross-sell products for the customer's benefit using one of the product page bullets. For quite a few years, I have used one of the bullets to let shoppers know they get a significant savings per piece if they buy a set of 2, 3 or 5 pieces rather than buying individual pieces. The shipping and return shipping cost is the same so we pass the savings on to the customers. That cross-selling helped customers, so it helped my sales.

Is there any way on my product pages that I can do this cross-sell?

For anyone thinking about suggesting I pay for ads: I have spent years, and many thousands of dollars, trying to get sponsored ads to work, with very little success - even when I asked the Amazon Experts for help.