Maps and rifts are an attrocious endgame
I personally prefer to have the endgame to be the campaign areas but with activities
Maybe open up a couple of side areas as dungeons
Have challenges
Challenging mechanic that increase the difficulty
Pretty much the type of activities I would have love to see in D2R
Especially the king of hells mechanic where the more % cleared a game is the harder the mobs become but also new challenges and bosses unlock