Merit is given by other users that find your post useful. It's not easy getting merits, and I wouldn't focus too much on it. Instead try to learn all about Bitcoin read a lot, and be helpful to other users requests and questions. At some point you will get your first merit, and your second. And soon you will see why you receive merits, and why most of the posts do not. From your history I can tell that most of your posts just answer with an opinion about something that has nothing to do with Bitcoin. Those posts will not get you far, as they are considered useless and spammy in this forum, thanks to all the bounty campaigns.