I've read posts and all I saw is to stay active. Is there any other ways to increase rank? And also, how can i earn with low rank?
Make yourself useful in this forum by helping other members learn more on something you know more that should be related in crypto such as mining, trading, gambling, this whole forum system itself, and etc. Through this, you'll be able to be given merits by merit source and other members who still have sendable merits that are willing to give to anyone who desserve it. Once you've got enough merit and acvity, you'll eventually rank up.
You may read more information here:
Fot activity:
https://bitcointalk.org/index.php?topic=178608.0For merit:
https://bitcointalk.org/index.php?topic=2818350.0