Maybe you put a 500% tariff (at least, since plastic is such a cheap product) on the most dangerous plastics (the ones that are known to disrupt hormones).

Also a domestic plastic tax - by making plastic less cheap (perhaps have it go up 10% every year in perpetuity) eventually there will be incentives to find natural alternatives (paper, bamboo, woods, etc).

It makes no sense to me to claim the most productive country in all of history, with our AI and everything, couldn't replace plastic. It's the same thing people said about oil 50 years ago.