The key is 100% boycotting all services provided by a company. Wikipedia’s list of Amazon product/services as reference (https://en.wikipedia.org/wiki/List_of_Amazon_products_and_services).
Incidentally, I know entire neighborhoods that don’t have other grocery stores besides Target/Whole Foods, not to mention that AWS is the cloud computing industry standard… As a personal example, my vet-prescribed cat foods are manufactured by Purina, a subsidary of Nestlé (needless to say, a separate but also extremely evil large corporation)
If you strive for perfection you will always fall short. Just do what you can. I started actually going to stores instead of buying things online, but sometimes that is not feasible. If I absolutely have to buy something from Amazon, I canceled my Prime and just wait longer for my packages. As for the other services Amazon provides I have no idea. Look for alternatives as best you can.
The goal is more about giving as little money as possible to Amazon. You don’t have to go cold turkey and cut it all out if it causes problems for you. Use this time to research alternatives for the future as you pivot away.