This seems hard but it isn’t. It took me 40 attempts, then I got the trinket you mentioned and it took me 5 attempts with it. It’s just a matter of getting used to all the adds and things to deal with, once you do that it gets 100x easier. I would suggest not using consumables until you have fully learned the fights.
Now for the actual advice. When you see the eyes just sunfire or moonfire them and you can pretty much forget about them if they aren’t casting at you.
Just do a cycle of using trinket, barkskin, trinket, bark, trinket, bark, etc. . You want to wait for the purple adds to stack on you and the boss when you pop trinket so you can cleave it all down, sometimes you can even kill without using incap roar.
The infernals are just a keep moving check, if you keep moving side to side then you shouldn’t really have a problem with them, try to throw a couple dots on them if possible but it’s not the end of the world of you don’t. You want to try and keep them taking cleave as it will help if you are having trouble with them.
The big caster guy is just a loser who hits you with wet noodles until you die, the only big thing with him is kicking his drain life and dpsing him when you have nothing else to do. You want to kill him as you finish killing the vortex adds, if you don’t Kruul starts off harder than needed.
Kruul is simple in theory, but by the time you get to him your adrenaline is pumping and you’re probably not thinking the best. So for him you want to kick his twisting reflection (if you don’t just jump off edge because you won’t kill him). The first annihialte you can just tank it at full hp and then frenzy regen it. Second Annihilate you want to use barkskin+frenzy regen. For the third (people got upset at me last time I said this, but it worked for me so ) you want to just use your orbs up, when he is about to cast annihilate you want to just pop a quick orb and then keep dpsing him. Keep moving side to side as the infernals will camp the orbs if you just move predictable in a straight line towards the orbs.
Speaking of orbs, I forgot to say that you can use 2 before you get to kruul. You can maybe use 3, but if you have to use 3 it’s gonna be a very very tight squeeze on kruul. I like to wait till the 3rd wave and then pop trinket+orb to just do massive damage to everything.
EDIT: woops I just saw that you got it. Congrats!