If you have a quality post or thread, You can post it's link some global merit thread. They are giving merits if your post is really quality even if its in your Local Board.
Uh...there's that one thread I know of in Meta for undermerited members/posts, but the ones that get linked to there are usually posts made in English. I'd love to be able to help OP out, but I wouldn't be able to read his posts. But I thought the Indonesian board was pretty well-covered as far as merit sources go. Maybe I'm mistaken.
Well, to be honest, if you want to have a high level discussion about any subject related to computer science, coding, new technology, etc you must be able to speak English, because all high level discussion happen in English.
As the best discussions are in English, it is natural that most merits will flow to the global forum.
I tend to agree with you there, but as far as posting on the forum and earning merits goes, knowing English and being able to write it correctly and coherently is a huge advantage, whether the discussion is high level or not. Most merit sources frequent the English sections, and there probably aren't enough sources for each local board.
My advice is that if you can't write English very well, don't try to earn merits that way. Many have tried, few have succeeded.