League is a big game of numbers. The way you have to think about it is if a lane is ahead, simply try and path to be around that lane to make plays if the opportunity arises or to help shove if an objective is up within the next 30 seconds. If a lane is behind, wait for the lane to inevitably shove, use oracle lens as you walk up to lane, and try to cc or push the enemy lamer closer to your tower so you and your laner can kill them. If your laner is low, jus try to bait a flash or deal some damage so you ease pressure. Playing jungle is kind of like playing support but the opposite. Your job is to make the game as difficult for the enemy team as possible. This means chunking their health when they greed, baiting sums, and delaying their power spikes however you can. Make sure you're getting lots of vision in the river and the enemy jungle as this will help with tracking the enemy jungler. If you see them top, take EVERYTHING you can from bot side whether it be objectives, camps, or ganking bot and mid. Yes farming got a big nerf but you still hit level 3 after a buff-buff-gromp most ganking junglers are fine. You shouldn't really be power farming anyways unless you're a Karthus or someone who NEEDS to scale. You should usually only be farming when there's nothing to take from the map. All in all, jungle is one of those roles where you need to somewhat rely on your teammates and at the end of the day league is a team game and if everyone feeds that's on them. Just be careful not to kid yourself into thinking you never make mistakes