I Have no Idea how to Jungle Anymore

I've been a jungle main since S1 but now I have no idea what I'm doing anymore. The pace of it, when you take camps vs when you gank, when to go for objectives and how to coordinate all of these things with allies... I got really used to it in S5 and now I've got no clue. My instincts tell me to do what I've done before, which doesn't work. I get predicted and the enemy jungler is always two steps ahead of me and it's stopped feeling like they are really good, but rather, I'm really bad.

I do still want to jungle, but I need some kind of a starting point. What the hell should I be doing to help my teammates the most?