I finished a game for the first time in years recently, Deus Ex Mankind Divided. Before that I can't remember the last game I finished. I mainly play games that have no ending like Paragon, Marvel Heroes (RIP x2), Warframe, Path of Exile, The Crew 2.
I put over 1,000 hours into Dragon Age Inquisition (a ton of that from the multiplayer) and haven't finished Trespasser DLC yet, I haven't even started it. I tend to test out builds, classes, and party compositions for fun, and when I'm too powerful I get bored. With Divinity the best part of the game is the first map, then it gets way too slow (waiting for turns as more enemies are added, and the story lose my interest) and I lose interest, not a fan of strategy turn based games. Pillars of Eternity is a lot better due to the combat being faster and closer to Dragon Age Origins, but the disinterest in the story makes it hard for me to return to my mega powered party. When I start Pillars up again I usually start from scratch since I forgot everything, and it would be a new build or party to play with for the new mood.