Hell Baal and Kabraxis are extremely easy with a trapsin. If you don’t master the mechanics yet, pop a fire trap, a catalyst and focus on dodging. It also works wonders against spirit of Guyia. Endgame gear is pretty specific, but the set can get you far. Like in the 130’s. Very tanky build based on vitality. I had 17k hp on my last one endgame.
As for Astrogha, my favored slower strategy is to cast or hit her only when it casts totems from far away. This ensures he won’t heal if whatever skill you cast hits something else. Also use it only once or twice. If Astrogha starts to teleport everywhere, it will get harder to keep the fight under control.
TL:DR: Make sure Astrogha is near the edge of the screen and that the totems are cast in your direction. Use your skill once or twice, pull back and clean adds. Repeat.