I see you play similar champions (recently hit plat 3 from gold 5, took just over a month). I'll just show you one way of taking advantage.
There is a typical mistake gold-plat junglers make, which is THEY USE THE SAME JUNGLE ROUTES. You've probably heard that diamond junglers mess up jungle routes to confuse enemies. Well... in gold or plat, they always do the same thing.
Imagine: enemy red side, you blue side.
What is the enemy going to do? Well, a typical jungle champion is going to do blue buff, wolves, then red buff, then gank OR do river crab.
So the question is, what do you do?
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You can gank or counter gank by doing the typical path: red buff, wolves, then blue buff. Depends on factors such as: stronger 2v2, lane/minion situation, you know that the enemy will gank mid or top, etc.
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But what if you do this? Pick a jungler with a strong clear (nocturne). Make sure the enemy isn't starting from red side. Do red buff, krugs, raptors, riven crab, enemy gromp. Then, you back to base with exactly 650 gold, buy the other jungle item plus a long sword quickly, and head to your blue buff side. Most likely, the enemy won't have taken the blue buff. Even if they have, it's okay because your are stronger (long sword) 1v1 or 2v2, and you can counter jungle their top side now (enemy choosing to take your buff means that their raptors and krugs are still there). You can out farm the enemy jungler by 1 level already. If the enemy does not take your blue buff, then you can clear your jungle and gank top.
Now, the enemy can't get their gromp or the river crab on dragon side.
But now you know where the enemy is going to be. The enemy will go to do wolves, see that they don't have the gromp or the river crab. The only thing they can do at this point is gank, counter jungle your side, or be super confused. If the enemy jungler counter jungles you, that's a risky play because he's probably out levelled and out farmed at this point. Even if they successfully take the raptors, that means you cleaned their raptors.
Now you base. Head bot, get krugs. Well, your raptors may be gone, but you know their gromp is up! Go get it again, check wolves to make sure they're gone, otherwise take them. Etc. Etc. Place a ward so you check double check the enemy jungle position and progress.
Enemy constantly gets out farmed and location revealed. This is the out-farming style. You ward enemy routes along the way to spot their locations and prevent ganks. Your team will magically perform better. Watch out for jungle champions too. Kayn starts raptors then does red. Hecarim starts blue. Gragas has surprisingly bad sustain early/clear due to nerfs. Always cover mid after buff when the enemy is ezreal because your team is stupid and will give first blood.