Help needed

I’m a hard stuck silver 1 jungle. I understand the knowledge of jungling pretty well, but definitely not perfect. I am decent at creating a gameplan/pathing/lane matchups/wave state. I feel like I just become useless mid/late game and always lose. Can someone recommend a good champ pool for each type of champion I need, so I can focus on just bettering my game sense more? All advice and help is appreciated, thanks in advance.