It's unfortunate that you don't like first person view, otherwise I'd have said Borderlands 2, or Pre-Sequel. For me, Borderlands 2 is a masterpiece, but that's for my tastes. If you're into third person view, you might like Dragon's Dogma (it's on Steam, I'd get that version, too). If you're just looking for a more classic Diablo-styled approach, and excluding the ones you said you already played before then I'd say your "best bet" would be Titan Quest. If you do play that, get the Steam Anniversary edition, it includes (possibly all, perhaps even more) of the community updates made over the years, along with other things (just check the details on its Steam page).
You've already played the other 'major' ones like Grim Dawn, Torchlight and Path of Exile so there's very little else worth mentioning, maybe other than Van Helsing and possibly one of the games of the Sacred series (if you do play any of those, maybe try Sacred Underworld, instead of Sacred 2 / Gold, personally I didn't like Sacred 2 much; although the whole Sacred series might just be "ok" at best in retrospect, but I used to play the original quite a bit, until I realized I could be playing Diablo 2 instead).
And this is perhaps pushing it, and we might also have to cross our fingers collectively to get that one here before we die of natural causes... but there might always be Lost Ark, some Korean MMO Action RPG, 3D but in isometric view (so essentially their take on Diablo). It looks very over the top with the usual Korean MMORPG scenery porn you'd expect from them. It really does look good, and the gameplay genuinely looks fun. However, obviously, the very fact that it's an MMORPG could be the major turn off, will definitely be an "always online" thing like Diablo 3 too. Still, it's being tested (Closed Beta 1 I believe is still going on, Beta 2 in a few weeks I think), but their road-map for testing phases guarantees that it won't be released in NA this year, and most likely not even in 2018 either. If we're very lucky and the translations are all done by then, maybe 2020... but I might have forgotten about it in six months from now.
That's... pretty much it I think. Now surely, there's a few others perhaps more obscure, less-known games that we aren't thinking of right now. In that case a general search on Google for PC ARPGs would be in order.