There is not much to farming Tka Rik now. It's all really basic, the only trial I see throwing people off is the search for the bomb, even thats easy though once you realize what you need to do. Go in Tka Rik for like 20-30 minutes, and usually ( not all the time) You can pick up a thing of amalgumn or even a token of gold (usually takes a hour to hour and half to get a gold token, but can vary due to drop rates)
Kind of.
Some quests have tricks for getting a soul.
The ones i know (i have fish memory so i forget the names of the quests)
Test of time/speed: continue to pick yellow balls after the message "you can finish quest now"
The wakening: let the center mob wake up by himself having 10 stacks
That one where you have to kill at least 10 mobs to spawn mob in center: Kill 30 mobs instead.
That one where you have to kill 4 packs of mobs: At the end of 3rd pack, it says you can finish the quest. continue for the 4th pack.
I think The cattle has a trick, but haven't found it yet.
If someone knows more tricks to get a soul, please tell me

.
You need less than 1 hour to get 20 souls.
I usually accept the daily quest (5 trials) and the normal quest(10 trials) and finish them together. You will get at least 4 sparks if very unlucky.
After that I accept the 10 trials quest, start it and abandon it if 1st trial doesn't give soul.
I repeat as much i can and if not fed up of this.
Ofc, there's a paid addon for this:
https://alloder.pro/files/file/157-setmytkarik/
Cheers,
Avo