it's simple, always contest level 2, you win against almost everyone with few minor exceptions, i normally go for 3rd wave creash into turret, then eaither reset or let it slowly bounce back. If i have engage support i let the wave come to my turret and try to hold it or freeze, and if i have a janna/nami/milio or poke supp i'm perma pushed poking them under turret, just dont ego jungler unless you know you win 2 v 3. Also never rush attack speed boots if you go hail of blades.

most games you'll struggle against jinx and kogmaw if you dont stomp early, so eother ban one or the other. Cait and ezreal, even though they counter you, you can just outscale. everyhting else is easy pickings, try to be agressive in fights and go on practice tool to catch axes if you need to.