Don’t. You can’t. Accept that it’s impossible.

Note:
Someone who is emotionally unavailable generally keeps their emotional doors closed to everyone, and sometimes even to you specifically. No matter what you do, emphasizing no matter what, nothing you try will trigger any emotional response in them. Starting or continuing a relationship will hurt both that person and your own mental health. Value your feelings and your time, and move on. Give yourself space and opportunity. Any other relationship is better than one with someone like this.

Question: I don’t want to be in a relationship with such a person, I just want to help them, what should I do?
Answer: There’s absolutely nothing you can do. Do nothing. Step away and focus on your own life.

Question: Don’t make fun, I’m serious.
Answer: Same here.

Question: So why is this person like this?
Answer: There are many reasons someone becomes emotionally unavailable. It could be their family, the culture they grew up in, childhood events, a risk-averse personality, or past trauma. The last one is one of the main reasons and very easy to understand. They may have entered a relationship that overwhelmed them, and whether intentionally or not, their emotional doors and triggers got shut down. Respect these people and don’t hurt them, they’ve been through enough.

Question: So there’s no hope?
Answer: No.

Question: Damn.
Answer: Sorry.

Question: I’m emotionally unavailable myself. What should I do?
Answer: See a skilled psychologist and work through the traumas you’ve experienced to clear your mind and soul. Life is far more amazing than the hardships you’ve faced with a specific person. And people are too.