This is what I personally use to grind my way from nothing to Paragon, and I cant stress this enough, do your bounties and get Kanei's Cube, they both go hand in hand, and you can also do Nephalem Rifts, which eventually leads to Greater Rifts when you get Greater Rifts Stones on normal rifts, they are not always guaranteed to drop, your gonna want to run it until you have a healthy amount, then you can go wild on GRs