Lets Buff Le Jhin
We can all agree that Jhin isn't in the greatest spot at the moment compared to other ADs so how about a direct buff to help his late game potential.
Jhin's passive makes him scale incredible well with crit chance and attack speed in the sense that he gets more damage. While his auto attacks do a great deal of damage, during late game, his abilities don't feel very impactful in terms of damage. We already saw a champion's ability scale off of crit chance (Xayah's E).
[ http://leagueoflegends.wikia.com/wiki/Xayah ]
_Note: I don't know how to post an image of Xayah's ability Bladecaller to show the scaling so I'll instead just provide a link to her wiki page. _
Anyways, why not add a crit chance modifier to increase Jhin's output through his abilities (most notably his Q and R)? This would encourage those who play him to build into the intended build (crit chance) as well as buff Jhin overall. Since the scaling is crit chance, those running the lethality build wouldn't benefit as much as building crit.
A buff towards his Q (Dancing Grenade) and R (Curtain Call) should make him more of a threat as ADs should be in team fights. His current Q gains additional damage when it kills something as it's bouncing. That's fine and dandy, but the ability doesn't feel very noticeable late game other than providing minuscule poke. Giving the ability a small crit chance modifier similar to Xayah's.
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Her modifier is for every 10% of crit chance, you get 5% more damage; for Jhin, since this ability isn't all he has to offer it should be something along the lines of this: for every 10%, you get 2% more damage on the dancing grenade.
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His ultimate, Curtain Call, doesn't hurt as much as you'd expect (except the last shot), so lets increase the total damage of the first three shots by adding a crit chance modifier to the ability. An example being for every 10% of crit chance, you get 1.5% more damage for the first 3 shots.
Adding a crit chance modifier rather than increasing his AD ratio's or his base damage it to encourage the purchasing of crit items. Increasing his AD ratios or base damage could just prompt the return of the lethality Jhin so this provides a means to avoid that.
TL;DR: Add a crit chance modifier to Jhin's Q and R for more damage late game.