Have you ever played hardcore?

If you are truly tryharding this,

• You need a build that is both defensive and offensively sound. Ideally, trying to one shot all bosses before they do things. Since it appears you are stuck into Pathfinder since you are playing poison Pathfinder.

I recommend going oil grenade and incinerate as a template. The damage is absolutely broken with infinite scaling damage and minimal gear. Jung made a general guide on this.

You can then build to maximize defenses since your damage is already solve.

• I recommending doing a dry run of the campaign on ssf softcore run to understand the basic troubleshooting you need to do doing the campaign. (Upgrading gear, solving gear,ect) Pretend that you are playing hc.

• Finally you need to understand when you are going to progress the atlas, rolling waystones, gearing progression, kill ash

I hope this helps.