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I’ve often echoed that earning a few merits, and scaling through the first few ranks, should not deem too difficult, but rather more so moving along the mid-to-high ranks, which require many more merits, and where people are likely to be more demanding for meriting posted content than on the lower ranks.
People here and there have posted their meriting criteria, such as
on this recent thread. Reading through may provide further insights, although bear in mind that people have likely conceptual criteria, but things are nor written in stone.
The idea, in general terms, is to create content that is potentially interesting to the reader, be it in the shape of information, questions, answers, criticism, and whatnot, and wavering the flag of being meaningful, as opposed to meaningless or excessively redundant. The way you express yourself and the general layout are complements that help to convey the message more easily, and come in handy to bear in mind.
Being too eager may easily prove to be counterproductive, as it may lead one to be under the spotlight with a content that may not be that well thought through. Nobody should be expecting to get merited from the start, nor recurrently on most of the post he makes. I took my time to earn my first merit, well over a month, and if memory serves me well, it was actually for a little joke on my local board relative to price volatility. Not something to mimic, but goes to show that there is a variety of content that may be considered by others as interesting.