The previous post was starting to lose steam so here is another one.
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As always, please be careful of spoilers. Use warnings and tags when needed.
Feel free to share anything you want, or ask any questions :D
Lucky rolls to you all.
You can respec any character at whithers in your camp. Also as other have said circle of the moon druid can bear form to get an extra 60 hp (half from each cast) circle of the spore can spawn minions that can tank the hits that would other go towards your team mates.
It sounds like your problem isn’t just that you don’t have a tank but that you’re solely relying on Shadowheart for healing. In my run I’m doing an ancient paladin so I’ve got lay on hands plus the heal aura to subside her healing.
When you level up you can also multiclass to get some desirable traits from another class to help your comp.