But there are some users with quality posts that are not much different from my quality, but they are already ranked above me. I asked what they did to make it so easy for them to get it.
Your comparisons are so baseless, you can track through their profiles what they do that makes merit contributors pay more attention to their posts. Do me the best you can, don't be too forced to rank up immediately by expecting Merit in your posts. Someone will judge a post subjectively, if they think your post deserves merit, they will appreciate it. Keep learning to increase your knowledge in forums, when you understand the ins and outs of forums well, it will be easier for you to get merit.