How do you know what you're passionate about in life? What are the methods? I want to find out my passion.
What you are really asking is "what is something I like that society approves of that I can work on my whole life while being happy about working on that one thing my whole life?" Sorry, life is much broader than that, if you're a human I'm sure there are things you like to do, just follow that excitement. One such hobby is watching anime which I know or you wouldn't be here. There are a million of things you could do within the anime community.
Ok maybe not a million things but you have more than enough options to consider for your path in life.
You see we have 3 minds, the original mind, the conventional mind and the dimensional mind.
The original mind is a child that says "I want to teach the entire world!"
the conventional mind is the same child now an adult with his dreams killed who is your average teacher in school.
The dimensional mind could be the teacher who perhaps makes youtube videos in his spare time teaching kids all over the world in countries without education in a fun way, gets payed handsomely and is only growing in audience.