Probably the best way to get merits is by helping other people, there are plenty of forum sections where you can help new bitcoin/cryptocurrency users or anyone in general. You don't necessarily need to write full pages of content to get merit as long as what you write is useful or helpful to someone.
Rightly said, I remember there was a member who asked some unique query about his account. He mentioned in the thread that he will give merit to the members who help him with the issue. Two members replied to his query, he send 1 merit each to both members and then locked the thread.
I think this should not be mentioned in the thread but it is obvious that if you are helping new members here even the senior members will notice this soon.