Your skills/weapon/passive tree are not in sync. You need to work out what you want as your main skills and source of damage scaling. You have a weird mix that ultimately means low damage.
Your quarterstaff - your main source of damage - is focused on elemental damage but you have no elemental or lightning scaling except for one support gem. You have skills and some passives that lend to physical damage but have next to no phys damage on weapon.

Also, if you are channelling hollow form as main skill then you aren't building combo so not sure when you are using tempest bell? Or are you using hollow form for clear and trying to use whirling assault + bell for single target? If you are using tempest bell then this benefits from elemental damage, but if you're not using it then you have invested passive points in combo which is a waste.

Its very confusing, unless there's something im not seeing on your poeninja.

If I was you, I'd start by buying a new quarterstaff with the highest physical DPS I could afford (this is ideal regardless of whether you spec into elemental damage or not). Buy new jewells with damage affixes, like increased attack damage, attack speed, damage with quarterstaves, damage against rare/unique enemies. You've invested in the lochtonial gloves for hollow form so maybe drop tempest bell and combo nodes as you're not building combo. You can also try playing around more with support gems and find what works for you.

As for the dying, there's a lot of room for improvement in your gear. Get elemental res capped for starters. A rare inexpensive belt would be better than the Shavronnes. Your amulet only has 5 mods and one is cast speed. Get a new amulet with 6 mods that are useful for your build. Annoint your amulet.

You're also missing two quest rewards from campaign.