but what should I do to improve?
You should read and start participating in real discussions here in this forum if you want to improve. Also, avoid shitposting(posting things that are off-topic to the discussion in a thread) and spamming in order to rank up.
I have seen posts of mine which were not really considered very good in spite of my best efforts.
Always remember that when you are really making a constructive post, a merit or two will inevitably come your way no matter what your rank is so long as you are participating in discussions.