Is it better to take out as much insurance coverage as possible?

I'm trying to sign up for health insurance,
but looking at the coverage options, it feels like I need to add everything.ㅠ
Since there are diagnosis fees and treatment costs, I feel like I should add surgery fees too.
Even for treatment costs, there are so many different types of covered and non-covered items.
And I feel like I should include injury and disease coverage as well..
It's just too difficult.