Just remove ALL player power from torghast and only offer mounts/pets/cosmetics and have a unlimited mode and a challenge mode with both having leaderbords with different categories and lists.
Also add new themes that rotate each week or month.
Again NO PLAYER POWER only just for fun.
You can still go back and do TG.
Would be cool if they added more cosmetics to obtain in it tho. 
I didn’t enjoy TG, it felt tedious. But, if there are people who are in mood to play it, then why not 
It’s designed to be in theory infinite, so it shouldn’t be much of a work for more floors to be enabled.
that’s what df needed but instead they kept adding new currencies with trivial events
It doesn’t fit in the story at all hope they don’t add it as it was.
But Torghast isn’t fun! 
Besides; that place is in the Shadowlands. We really shouldn’t have a reason to visit that place ever again, lore wise, imo.
If im 100% honest id rather have a new type of garrison than thorgast.
What lore has to do with anything?
I despised Torghast, it was a boring chore. But people are all different.
I can’t see them making a special mode for it though. People can still go back and get the collectibles if they want them.
I still have some to get but I really have not been that bored yet.
Maybe they could let you scale down for it so it felt like a challenge?
It’d be nice to have another endgame alternative at least. Raids and M+ gets very same-y after a while.
Leave it as it is.
But add something similar that fits with Dragonflight.
Although things I would do differently.
No Timer or Scores. There could be some achievements around doing it in a certain time or similar.
Only cosmetic rewards.
The scaling should be done so that soloing is as viable as a full group.
No limits on accessing, whether by a weekly wing or a currency to enter. Perhaps there could be a lockout for looting like with raids but players can enter to practice or look around as much as they like.
Take the system of Torghast, put in Caverns of time, allow people to experience different biomes and historical events, while doing the Roguelike stuff.
The new bring back the Mage Tower. so maybe in Expacs time
Or they could just give it an infinite multiplier mode like M+ keys. No extra rewards for reaching difficulties beyond what’s currently available, just the feeling of achievement for pushing as high as you can.
Hate choreghast.
Sure, why not?
Torghast can be over there doing its thing and we can all ignore it - or do it if we want to. That’s exactly how most of the content in this game should be - easy but not trivial, ready at your fingertips if you wanna have a good time with it.
Toghast could have been amazing.
Blizzard took something that people loved on the PTR and ruined it because they couldn’t resist making it “mandatory”.
For sure! But not Torghast! 
For me personally it was horrible from the start.
It’s just bashing through mobs and mobs and mobs. Boring as all hell.
But then couple that with drab and depressing surroundings… that all looked very same-y… completely ruined any interest I had in it.
Only redeeming factor were the powers, but honestly… for BM hunter the powers were boring and lackluster.
You just described every new “content” that was added to DF.
Fyrakk? Mobs and mobs. Time rifts? Mobs and mobs.
Researchers under fire? Mobs and mobs.
Boring as hell or nah?
ATLEAST, there are no CHORES!
Best expansion ever.
Torghast was kinda boring. I tend to love solo challenges but i didn’t even bother with the infinite corridors.
I need to go back and do that sometime.
The idea still has potential, just like island expeditions, but they couldn’t land on a good/fun structure and reward system.
They should bring back that content sometime. Islands were really wasteful cause they looked great