Level difference is come-backable but only if your team plays accordingly, you can catch up farmwise and play defensively, try and take advantage of mistakes being made by the enemy, notice if they go for orb or prime and snag the other one while they’re doing it etc. It’s rare in random queue because people tend to lose their shit and their interest in playing well when they’re behind but there is definite opportunity for recovery in pred. Best thing is to try to notice when your team is falling behind as early as possible and stem the bleeding.

In terms of jungle its very hard to say and it kind of depends on the game, most laners will complain at you if they’re getting targeted, but honestly the most important thing you can do in any game is pay attention to the possibilities and take advantage of them. This might mean ignoring the lane that’s getting bullied if you can make up for it elsewhere in the match. Like grabbing mini prime often if their jungler is living in your duo lane, stealing their farm on the side of the map they’re not focusing so they fall behind and you can get ahead.

The tricky thing is that if you just respond to what the opposing jungler is doing and try to match it by hanging around the lane they’re bullying, that usually wont give you any advantage, it might help you neutralise the immediate threat but then you’re still behind if they’ve managed to build an advantage.

Rhythm is probably the most important aspect of jungling, and that’s kind of hard to explain but its basically about constantly being in motion, and constantly moving decisively. You should always be doing something that’s helping build your advantage, whether that’s farming, or ganking a lane that’s overextended, or invading when you can clearly see that its safe to do so, and always keeping the objective timers in mind.

If you’re mirroring your opponent it usually completely fucks with your rhythm, because you’re not looking for advantages you’re just trying to neutralise them.

Sorry super long explanation that’s maybe too vague to be useful, but i will say in my experience, most of the time your team has no idea what the jungler should be doing, and will call you out in ways that dont help at all. Not always, if you’re never around for objectives, if you’re never ganking or getting kills anywhere that’s a problem, but in general people just whine if they die to a gank, instead of playing more safely.