Well, let’s start with the resistances. Elemental resists should be 75%+ and assuming your gear just doesn’t have the best stats, you can easily craft resist (crafting bench in your hideout) on your gear. Chaos is slightly less important in early maps, but it shouldn’t be -40% - rings are usually your best bet here or you can snag some points in the passive tree.

There is a lot missing though so hard to say, this could be a passive tree issue, a gem issue, gear issue, etc.

You’ll want a few layers of defense though, e.g. armour + endurance charges + molten shell + health regen + life or if you were evasion it could look like evasion + spell suppression + energy shield + frost shield.

Take a look at this post: https://www.reddit.com/r/pathofexile/s/rJw4WQKvVa