How do 你 become a dedicated 或者 die hard 粉丝 of something?

你 have to do it because to be the best however 你 spell it, it is apart of 潮流粉丝俱乐部 i think ;)

你 have to be really very active

For your part, all 你 can do is contribute a lot of things which can be fanned: images, videos, 链接 and articles. Other people then 粉丝 those contributions. If 你 get enough 粉丝 of what you've added, 你 become a dedicated in that club, if 你 get 更多 again 你 become a die hard and so on. It helps to contribute to active clubs, because in those others are 更多 likely to see what you've done and 粉丝 it.