I think the biggest benefit to Amazon (still) are the number of extraneous items often in people's carts. For instance, some moms order from Amazon all the time. All the time. Back when item volume mattered, probably 2 or 3 moms bumped me into a new % tier because they each ordered 200+ food items.
I've focused on products in non-blurred niches... as you can see, you'll pick up sales in all sorts of random categories.
Your cr looks great if you can increase the volume.