all my post and replies not copy-and-paste jobs but i just have only one Merit

i wondering how Bitcointalk determine a post is quality post

No, but your posts are insubstantial and spammy:
no worries, we believe end of the year price will rise

i dunno forex but i know crypto trade

Just hodl and wait, no point u sell now right? just be patient
Be honest - if you read something like this written by someone else, would it make you stop and think or want to start a discussion with that person? Posts like this contribute nothing to the conversation. They are just padding your activity account. You will struggle to earn any merit until you learn more and contribute meaningfully to the topic.
Thanks. Seems to be very similar to the one JC posted earlier in this thread, albeit with a higher word limit. I generally use sites like this as a last resort if I can't find it myself in Google - the 4-5 captchas for every search annoys me so much that I just give up.