How to Complete Greater Rifts

I'm so confused. I have a Monk, Necro, and Barbarian all BIS geared and mostly enchanted with the right stats, but for the life of me I can't get passed like 95 consistently on greater rifts. I just die too much. Is there some secret I'm missing? The answer can't be just keep throwing my face at it until I get lucky, right?

Edit: Someone recommended https://maxroll.gg/d3/category/guides. I swapped to one of those guides for my WW/Rend Barb and got to 100 easily. Please keep recommending tips because I'm learning a lot but apparently Icy-Veins's guides just suck.