Suddenly forgot how to play, need to start fresh.

So I have always played jungle but recently I feel like I can't play the role anymore. I used to play Vi but stopped player her because I ran into too many in game bugs that resulted in a loss, used to also play Hecarim and Warwick but I started to perform poorly on them and seem to not be able to carry with them as they play tanky. And I play 2nd role top but I get frustrated top as I just seem to get camped with no counter ganks (I understand the jungler can't be everwhere). Just seem to have suddenly forgotten how to play the game. Need some advice.
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