-Short replies don’t help — you need to write like you're helping someone.
True because majority of us will definitely help the OP so if you're lacking then your post will definitely be ignored.
-Posts in quiet threads may never be seen — post where readers hang out.
True, you should always engage to some mainstream topics or be updated on every discussion about crypto and also here in the forum of course. In order to be a good poster, of course you should always be updated on facts and news, because it'll become useful to other contents as well. You don't want to engage to some topics, and your info is very outdated.
-Original thinking matters — don’t copy anything, not even from your own posts.
I agree to this.
Originality is a factor but if you try to add on OP with additional infos, that's good also.