Removing the merit would be a disaster because it can easily be abuse by the members and It is a big issue in the forum in the past years, because members can easily rank up a lot of members abuse signature campaigns and bounties here in the forum.

There was no guide about how to earn merits since the merit needs to be given by some other members here in the forum, You cannot guarantee merits even though you have a high-quality post. Some of your posts are posted in sections where merits are not commonly given like games and rounds, off topics, etc. so I guess you could focus on other sections where you help members like Beginners & Help.

The best way to do it is just to continue your journey in cryptocurrency and then share your experiences and answers some questions here in the forum in that way you are helping the forum to grow and at the same time, your gonna have a high chance of getting merits.