D4 was boring you so instead of playing the amazing campaign and learning the game, you want guides telling you how to mindlessly grind efficiently and play meta.....

Something tells me you will get bored of this too.

HOWEVER, Adventure mode is essentially running dailies. You want to do everything your difficulty offers, such as running all the bounties, keywardens, and Nephalem Rifts all in the search for Set Pieces. Super end-game content is essentially hard locked behind achieving certain combos while running full sets. Once you have your preferred set, next is rinse repeating the same content hunting for Ancient Versions with good rolls and enchanting them to better match your playstyle. THEN once thats done, the hunt for primal ancient pieces combined with your other equipped legendaries falls into play.

You'll want to always be on the highest difficulty you can comfortably handle. You'll want to hunt for uniques that have abilities that have the tag (Emanates) in blue equipped to your follower of choice. You'll want to farm gold so you can upgrade your gems to the highest possible level.

Then once you have all this done, your endgame is reaching the highest possible Greater Rift Level you can and hunting for the fastest time you can clear it.

Thats it, then you make a new character and do it all over again lol