Since March 2021 that you have been registered as one of the forum members, you did not know merit system and ranking.
Uh huh. This looks like a few other threads I've seen about merit created by members who've been here long enough to know what the system is and how it works. In fact, I remember posting something in the last of such threads that kind of applies to this one (except the post history check, which I haven't done in OP's case):
I checked your post history and the only other post I could see besides the one you made here is when you voted in the community awards thread. Plus your post count is very low in general for someone who registered in 2020. I have no idea why you're just now asking about how to earn merits, but a general rule is that the more posts you make the better your odds are at earning merits.
Take note of my suggestion of increasing your post count, OP. It's really hard to earn merits when you've only made 24 posts in 16 months.
That's assuming this is your only account, which I seriously doubt.
Oh, then there's that.