Looking for Guidance on poison burst build

Fubguns guide

https://mobalytics.gg/poe-2/builds/fubgun-poisonburst-pathfinder

Your bow is weak, you need an obliterator bow with +skills and increased % phys damage

your quiver is also pretty poor, you want +2 all bow skills on it or at least % increased damage with bow skills

Also buy an amulet with +2 projectile skills and + spirit

You need to get 20% quality on your flasks for more life and mana heal as well

And you want + spirit on your armor as well

You need to focus on leveling first before you start big upgrades. You can join a temple run to shoot up to 90+ but you will never have survival in your build outside amazing offense and that comes from your weapon. Get the best dps you can that’s phys and then focus on +skills. I’d wager you can find some decent phys dps bows unfinished an add +3 with a p battle pretty cheaply. But mostly just keep your tiers at a level where you still get positive experience and focus on leveling the follow a guide like the one posted in comments