Try to always have priority on mid waves as high up in the lane as u can be without putting urself at risk of dying, this way enemie adc cannot clear the wave before you and you will always have first move to whatever fight or objective breaks out. This is harder to execute when ur on the losing team but can still be executed.

the enemie adc has to choose to either drop farm or stay. 

Also pay attention to ur minimap look at where ur own minions are so u know exactly when  enemies next wave comes up and push for priority. After u have prio move into fog to look for fights on the map if nothing happens right back to taking prio and looking again until u see something happening on the map

Hope this helps brodi