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It’s not just a question of how, but where. The "how" I assume has been introduced by the posts answering to you on this same thread. There are plenty of other threads around on the topic, and it finally boils down, for the most, to being able to invest some time to create well-versed posts (be they topics or answers).
The "where" has quite a saying in the matter. For example, you are posting mainly in Altcoin related sections, the majority of your posts being in the local Korean board. Unfortunately, some local boards have very little activity, and the number of people with meriting capabilities there may be scare.
Your local board renders 6 sMerits awarded there during the whole of 2019 (5 in May 2019 and 1 in June 2019). Not much to go by if you concentrate solely on your local board.
As I said, the key is content, but placement has quite a bit to do with it. You should find those forum sections you are most comfortable with content wise, and give them a go by posting some decent content there. Take a look here to get a clearer view:
https://public.tableau.com/shared/H86RFHF6B?:display_count=yes&:origin=viz_share_link