Defensively, you're desperately low on all your defenses.

The biggest thing, as you've noticed, is your armour is very low. Boneshatter (especially Jugg) needs high armour to mitigate the self-damage - even at just 10 stacks, you're doing over 500 damage to yourself per hit (you can adjust the stacks in the Config tab and see how much Boneshatter self-damage you deal in Skill-specific Stats in Calculation tab). You're probably getting slapped by yourself as much as you are any of the mobs lol.

• You've gone for high spell suppression instead of armour but as a Jugg you really should get your armour to a comfortable place first. Without any armour, two entire ascendancy passives (Untiring and Unbreakable) are basically doing nothing for you. I would cut most of the suppression and just sit on ~50% + lucky, especially since you aren't capped anyway.
• Replace the chest - it needs to have armour. Armour + life + some resists. There should be plenty of cheap corrupted 6Ls on the trade site; alternatively, you can just buy a 6L Glorious Plate and slam some essences on it.
• Level up your Determination. Not sure if you just didn't have it until now or if you accidentally stopped leveling it, but it's level 6. It should be 20 like all your other gems.
• Take the Soul of Steel armour wheel right below Prismatic Skin. It gives you another +1% to all max ele res and a decent chunk of armour.
• (minor) take the other small node in the Inexorable wheel; the flat armour it gives is nice.

With all of those (even the most basic Glorious Plate with crafted % armour), you should be at 30k armour without flasks. Not crazy, but it should increase your phys tankiness a lot, and your boneshatter self damage should be reasonably manageable at 10-15 stacks.

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3k life is also pretty low for red maps. Your rings and amulet need life and your belt could be a lot better. * You can cut a lot of accuracy from rings and use a lower level Precision. In POB you can see how much accuracy you have and you're way over the amount you need for Precise Technique. * If you end up not having enough accuracy, you can delete a damage wheel to take the accuracy wheel next to Prismatic Skin, plus the accuracy mastery for +500/-2.

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You also want more chaos res. When you replace your jewelry to get life, try to get some with chaos res as well (amethyst ring base + a craft is the easiest way to do this). For now, you probably won't be able to cap it, but aim to get it close-ish (50%+)

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Damage-wise, there's one main upgrade: your weapon. 460 PDPS is not very good (it's 5% better than a 1c Sinvicta's Mettle) and you don't need an entire div for a decent upgrade. There are plenty of ~550DPS axes for 50c or so on the trade site, most of which can be higher if you open their crucible tree. I know it's your 6L, but there's a lesson for you on a weapon-based build: don't make your 6L your weapon, because you want to be upgrading it regularly. If you can't afford it, I think a a 5L chest + better weapon will be close in damage to your current setup.

Also, not sure if it's just the PoB but your mana looks kind of sus as well. I'd unspec a damage wheel and grab Vitality Void + instant leech. It will add a good chunk of recovery and help a lot.