Which business units should be broken up?
Amazon (the retailer portion) and AWS, and probably their logistics wing
Not that it matters.,Microsoft has done a spectacular job of killing Xbox even with its ability to sustain setting money on fire for the past decade. Xbox has been an unmitigated disaster since Xbox One.
(PlayStation is almost in the same boat, except they have significant sales in regions where PC gaming is much smaller than in the US.)
This also works for Amazon retail, they should not be allowed to sell on their own marketplace (they have to choose, they are either a marketplace or a seller)
¿Por qué no los dos?
Baby steps bro, they will all have their moment in the sun soon enough.