At least things like Scientology and Satanism promised you things like wealth and/or powers. The only thing that trannydom seemed to have done for this people is to extend their masturbation sessions.
It does promise them something though.
It promises them the possibility of being your true authentic self. Many people don't feel like they are being authentic at times, feel like they are putting a bit of a show, or they lie to please others, etc. But by finding your gender, you could be your true, authentic self. Not what nature/society dictate for you. You will act only in ways that are authentic to you, that are true to who you really are, you will be the best version of yourself. Through a gender exploration/journey, you will find who you truly are. Your true self.
And you will have a big community of people who will support you, the
real you that you are inside. You could find your "chosen family", a family
you choose, imagine that. Who didn't wish they had other parents or siblings at some point in their life?
You will transform your body to fit who you truly are, and you will be the happiest you've ever been. You'll experience euphoria just by being yourself. Your difficulties, your discomfort with your body (what teenage girl doesn't experience this), the things you don't love about yourself, your difficulties with other people, the feeling that you don't fit in, it will all go away. You will be a new person, a person you created, the person you want to be, the person you meant to be, the person you truly are, you will be the creation of yourself.
I'm not joking. I think there is a very strong spiritual component to this, one you find in cults. This is what draws a lot of teenagers and young people, imo. Be the real you. Find yourself. Live your truth. Find other people who are like you. Build a community of like-minded people. If your family and friends object, cut them out of your life. They don't accept the real you. They don't love you, the real you.
You are special. You are better than these cis people who don't dare to struggle against society rules, who are locked in the prison of their assigned sex. These cis people who will never understand you. These cis people who think they are superior just because their gender aligned with their assigned sex at birth. These cis people who oppress you. That's why you are suicidal. You are oppressed by the cishet majority and their heteronormative ways they force on everybody. The patriarchy and the rich are the source of all evil. Conservatives are just evil people who want to hurt you. Everyone who object or question is the enemy. We must fight against the enemy.
Etc. etc. A leaderless cult that attracts people in the way cults do. Promising elevated way of life, living the real you, providing a community to belong to, providing a common enemy. Etc.