OP, who do you think owns the big supermarket chains, the big food manufacturers, large scale industry, car manufacturers, Google, Amazon, Sky, Spotify, Netflix, etc? It's not just Bezos etc., it's all the hedge funds etc that are owned/managed by billionaires.
If you really want to boycott the billionaires, turn off and throw away your laptop/smartphone, never set foot in a big supermarket again, buy all your food from local farmshops, buy clothes and household items from local/independent shops, sell/scrap your car, etc.
No, didn't think you meant that.
If you just "cherry pick" things that actually don't matter to you, such as an Amazon Prime account, you're just virtue signalling and it will have no impact whatsoever.