We already know Sakura is great, but let's make her even more greater. What do you think would make her even more greater?
Right now she has excellent chakra control, immense strength, and medical capabilities.
IMO, Sakura should learn genjutsu from Kurenai, have increased speed and stanima, have a chakra nature(possibly earth), and create some jutsu. Seriously, I think she is the only character that does not have any jutsu. Also, more screen time that does not show her crying or doing nothing. Afterall, she is a main character.
That's how i would make Sakura better...how would you do it? ^_^