As to difficulty… Get to floor 100 as soon as possible
Then work your way up to mythic 3…
Why mythic 3?
(Because Maths)
On mythic 3, with 20 heroic points into fortune, to maximize your Luck% and GoldFind%…:
Without Epiphany(5) on mythic 3
You only need 50% Luck
And 150% GoldFind
With Epiphany(5) on mythic 3
You need 212.5% Luck (one Crystal affix)
And 312.5% GoldFind (one Crystal affix and one Pet affix)
. Crystal affix are the light blue ones
I hope that all made sence 