I think there is no secret about it rather than make a contributory post to the forum and members. If you make a thread that is useful, after people finish reading, you might be lucky to get merit from the reader.
I agree, merit was given depends on our post by other people. Actually you dont need to stress yourself to have it. Just construct a good and high quality post which can see people worth it to give merit. You are new here. Better to study more and read articles about bitcoin and about the merit system.