Your rank affect merit if you are legendary you will receive merit if you not you won't receive merit
This is not at all true, write quality posts and you will receive merit, you could argue that you may receive more if you are legendary but that is simply because people may be willing to take more time to read your posts as they are from a respected poster. However you don't need a high rank to be respected and have people pay attention to your posts.
All these threads by shitposters purporting to give advice to other shitposters on how to gain merit are reminiscent of the cargo cults that sprung up in World War II. They see other people's posts receiving merit as though it were a gift from the gods, and think if they make their posts look similar, they too will receive merit. But like the bamboo control towers and wooden radios and coconut headphones, it's all form and no substance. They do not receive any merit, no matter how much effort they put into their mimicry. They don't understand what they're missing, so they inevitably complain that the merit gods are mistreating them. But the gods merely shake their heads and struggle to understand why the cultists ever thought their plan would work in the first place.
And the merit cultists' prayers continue to go unanswered.
While there are many that certainly are doing as you say (OP included), I'm sure there are some who simply do struggle with English and are trying to make their post quality better. We know that post length is not relevant but they may not.
Given that they may not have other ways to better improve their English, mimicry is perhaps one of the best ways they have to improve. Do not forget that as babies we learn almost everything through mimicry.
Writing in English can help you to be awarded merit as well.
AND LOL..