elo hell isn't real and jungle is honestly one of the easiest roles to climb with. having a good kda means nothing if you aren't securing objectives and warding. objectives are your job as a jungler. play an easy champ that you can tank and dive their carries with. shaco isn't a bad champ but hard to master, and mechanically hard champs are not the way to get out of bronze.
my recommendation is shyvana. that's how i got to silver and how im gonna get to plat this season. she's mechanically easy and very strong right now.
in low elo, nobody wards objectives properly, so you will gets away with soloing dragon and sneaking barons with your top laner. shyv's clear is amazing and you will be able to counter jungle constantly, as if you were playing shaco, really. i also recommend starting red and going for level 2 first blood cheese on their jungler. those kinds of things tilt people in bronze really hard.
i had a game last night where the enemy team was denied so much vision that i secured first blood at 2 mins, 18 kills, 5 dragons, and 2 barons in a 35 min game. meanwhile they had no drags or barons. those kinds of leads will bring you back no matter how hard you fucked up before. shaco is great early game, but in bronze, late game is inevitable because nobody knows how to end games properly.
i dont claim to be a master at jungle but i can teach you some things that will give you small advantages over the enemy team that will add up into something big