Advice on AoM acid retal Sentinel

Hello, I tried making a sentinel focused on acid AoM retal, with the idea that stacking +retal to attack for AoM will do lots of damage, unfortunately it sucks.
I tried to kill ravager for example, and despite doing damage to him I just wasn’t tanky enough. I’m not even talking about Callagadra.
I don’t even care if this build is salvageable or not, what I want to know is how can I understand if a build idea is viable, and what makes a build good or bad, so that I can use this knowledge for future builds.
Thank you all!

Maybe try the 4th build from this list: ⭐ Top 20 Softcore builds in Grim Dawn (An Opinion)
There’s a save file. It is a Spam Acid Retal Aegis build.

also here [1.1.7.1] Caustic Rebuke: 5:20m Crucible Gladiator, SR 90, 45 seconds Ravager retaliation caster Sentinel [sr+][c+][vid] - #58 by Stupid_Dragon (not the OP but one of the last post)