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Is there any standard to identify whether your post is in quality or not?
It's usually informative and helpful.
Like the length, contents or styles?.
There is no specific style of presentation or length. For content, other than what I already said above, it helps if the post or comment is not repetitive (it hasn't been said/discussed already). For presentation, at least have a good format (spacing, bullets, tables, etc.).
I've seen some posts that in my opinion are in quality but didn't get any merit.
"Quality" is subjective. Sometimes, quality posts are not seen because they are posted on spam boards like Altcoin discussion. Many senior members here rarely reads topics on that section.
~snip
Congrats on your new rank!
It's also refreshing to see forum members from Nigeria who aren't using the racism card. Keep contributing.