The secret is super long comments. Quote them, with "" instead of >,
express your opinion in the most longwinded ways possible. Beat all the way around the bush multiple times. Shun TL;DR as if it is the enemy. If you have no clue what you are writing about just keep on writing. Never let someone else get the last word in, keep replying even if it is as banal as something like 'no sir, you are welcome'. Also, comment on every post you see, don't know the person, don't have an opinion, well ask a question.
I know this is off-topic, but do you prefer mayonnaise or ketchup on your salad?
I'm not saying everyone or anyone in the top10 for that matter comments like this, however, it is just my suggestion if your goal is on the top.
Just make sure your comments are interesting to read.