It's hard to understand where to get merits. I'm not after with the merits though. Maybe doing efforts to help people make money here in bitcointalk could consider be a merit
It is likely that English is not your mother tongue, right? To get merits, you should sharpen your English skills, reading and writing are most important skills. If you cannot read and understand what others wrote, you cannot do anything. Your posts will probably off-topic due to misunderstanding. Writing threads in broken English make them really difficult to understand, which in turn will reduce your opportunities to earn merits from other users.