Abuse Invading in lower elos. Invading on champs like Graves Kindred Nidalee Kha'zix etc can be game changing. Lane Prio won't matter too much since they don't pay attention to the map. You need to play quite abit of games to get the feeling whether you should invade or not, or to know when you are stronger than your oppponent.

Another tip is that you should keep track of the enemy jungler, wheter you tell your laners to ward their jungle early, or you look at who gave a leash, or you ward yourself/you know the specific champ starts on a specific side of jungle. There is many champions and many players that will do the weirdest starts, so this will come with experience.

A very important tip is to ward your jungle and base for Red Trinket at 35 seconds

Red Jungle Base: Sit in between the raptors and the red gate and press B at 35 seconds, place the trinket down at 44 seconds (1 sec till you are in base)

Blue Jungle Base: Sit in between the midlane entrance and the top/botlane entrance and place the trinket in the Pixel brush.

Graves is a very strong champion in the meta even though his winrate has not been the best in the past months. Graves is a very strong early duelist, mostly invading champion. You can snowball very easily by picking up a kill or two early game.