Is there some way I should make a comment go to the top when I am writing a comment on the post page?
No, your comment, when you post a reply, will go to the top of the Comments list, and it will be, for a brief time, the very most recent post made on the whole site.
It is then replaced by the next post on any active thread.
People can scan by Article, by Activity, or by Comments.
I use “Comments” because I can see what people are posting about quickly and be exposed to many articles in a short time, then deciding which posts I might wish to respond to.