How to support better?

I don't ask because i am a noob, i ask because my primary Role is Support, but aside from warding bot lane and keeping my Adc alive. I am starting to feel really usless heading into silver games. When in bronze i felt comfortable as a suppoet. Now in silver its as if i am starting the game all over again. How do i improve? What can i do to improve? What is most important for a support player to master.

I tried being mid, or too. But because i am so used to ignoring CS for my Adc, i can't Cs right. Around 20min mark i have at least 80 cs as mid laner...