How do あなた become a dedicated または die hard ファン of something?

あなた have to do it because to be the best however あなた spell it, it is apart of ファンポップ i think ;)

あなた have to be really very active

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