How to play from behind as a jungler

Looking for advice on playing from behind as a jungler. I am currently in silver and lanes snowball really fast. I have had two games in a row where multiple lanes will give up multiple kills by 5 min and it puts me in a situation where I'm not sure what to do. I feel like the outcome of the game comes down to me not knowing how to proceed and allowing these ahead laners to get more ahead. Am i supposed to try and gank the lanes that are behind or just farm and let them continue to snowball. I find that if i try to gank the lanes once they are behind, its very hard to keep myself or my laner from dying. On the other hand, if i do not gank, we as silver players do not know how to play safe and the than continues to snowball.

Just looking for general advice for this. I main xin and warwick at the moment.