Sadly, there’s not a singular ethical Amazon replacement out there. You’ve got alternatives like Walmart and Target but I don’t think they rate much higher than Amazon, honestly. I’ll throw out Grove Collaborative for cleaning supplies/home things/toiletries, Thrive Market for foods (though they have a membership fee), Kindhumans and Uncommon Goods for a wide variety of things. Here’s a list of some more places that might be useful - bearing in mind there is no one panacea.