Fully stack Quantity/Rare monsters/+Rare monster mods/Rarity of items in that order on your maps (this needs cross validated, some people say rarity on waystones/tablet buffs might stack multiplicatively so I usually have some rarity on some of my maps I run but I dont think this is true), and stack quantity/density from your tablets with atlas passives making your tablets more effective and your waystones explicit modifiers more effective. Ive been running several 400% quant maps today (I cant run a ton back to back cause all the clicking is annoying), but each one has profited 2+ divines. You also want around 100% item rarity on your character. 50% minimum is pretty mandatory.
I don't get how people manage to get those 400% quantity. I have used 5 breach tablets on 5 towers allocated close to eachother all with 20% quantity on them but never reached 400%. And yes, I have the correct points spent in my atlas tree. Followed a guide for this. Somehow the 400% eludes me anyway