OK so I'm done with S12, took me like forever because I'm busy IRL. Went 4x Monks, got 4x 6P-seasonal set at start, and then 4x 6P-Sunwoko with Wave of Light, pretty easy build once you can run it.

The most boring part was the 350+ kill in a chest event, I had to create games over and over till I got the proper event. Of course I was creating 4x solo games, but still, what a waste of time.

There is good info here :

https://www.icy-veins.com/d3/curses-conquest-guide

I failed the Conquest twice while running the act 1 event "The Cursed Belows", with 324 and 336 kills, but got it at first try when I finally found the act V event "The Cursed Peat".