Philosophy being reduced to only pondering about existential questions is a tragedy of misrepresentation. Philosophy is the study of thinking, and that covers a very wide range of topics.
I, too, have no fear of dying. There's absolutely nothing to worry about. I won't even know I'm dead. The only thing that is a bit scary is the process of dying, especially if it is something that's really drug out, like a terminal disease. Then, I have to think about it for the rest of my life. Otherwise, if it just happens in a flash, like a nuclear bomb, I won't even be aware I died.
In addition to questions of end-of-life, Existentialism also deals with questions of purpose-of-life. Which can be mind racking even if you're not afraid of death.
Still not super interesting questions to me though.
And how is it even "applied"? I can't come up with an explanation based on my understanding of term, which is to use the knowledge of something to solve real world problems.
Well, existentialism and nihilism kind of apply an existential crisis to reduce your personal suffering. That only works if you believe them though lol