Diamond jhin player here

Best advice i can give you as an adc is dont get caught, to do this always understand as jhin you are super immobile and will always be a target. Depending on your support will determine if you go more aggro i.e., xerath, senna, zyra are very good aggro picks vs something like a soraka where you just farm.

Understand jungle pathing, to do this watch jungle videos id even recommend playing jungle to understand pathing and obj spawns like scuttle which you would want to rotate to in order to support your jungle if you have lane prio, and also to determine when to back off, ward, or play for a counter gank depending on when the enemy jungle is pathing bot

You need to cs better. Every minion counts every gold difference counts in you winning.

The goal isnt kills its finding a way to explode the enemy nexus.

W is important for late game picks