Even with the trailblazer nerf it's > other smites here are some balance suggestions

Instead of gutting trailblazer after finding out it's still powerful in the future how about making other smites more attractive? Not only will this bring more jungle diversity but make all the smites more attractive options and even allow tuneless pre level 30 players to use smites outside of trailblazer effectively.

Trailblazer smite

Cooldown nerf is fine.It already virtually gives any jungler sustain and clearing power powering trailblazer down a little won't hurt it too much.

Challenging smite

Damage on hit slightly reduced but now speeds you up when you smite someone for a couple of seconds.Challanged visual buffed to be more noticeable.

Explanation: Let's face it nobody will fight you knowing they're Challenged so if you smite someone they're usually going to run away.This problem of them running becomes more apparent late game when you're trying to kill the enemy ADC but you just get kited.A Movement speed component will make it so junglers who purchase this have an easier time making use of the active but at the same time giving enemys a chance to jump over a wall or CC you until the smite runs out.

Chilling smite

Boosts damage vs target by a percentage for a couple of seconds in addition to it's slow and damage.

Explanation: Most junglers who pick up chilling smite are gank reliant and won't be in their jungle to much.Chilling smite boosting spell damage will make it more attractive on AP junglers and by boosting their burst in a gank. Same reasoning applys for tanks (who usually do magic damage)as well who usually have trouble later in the game dealing damage.Chilling smite could give those tanks a little boost for the trade of clearing speed or counter jungling power.

Scavenger smite

Lower cooldown from 60 to 40 and smite effects last 2 minutes longer (5 second bonus for razor beaks) if you smite an enemy camp.In addition does extra true damage then normal smite earlier in the earlier in the game.

Explanation:This one is tricky as Riot on PBE is extending camp time to make counter jungling stronger.However you don't really need this smite to counter jungle effectively and all the other smites are more attractive as well.So giving this smite more reward from countering makes it as good as trailblazer for clearing in the sense that it doesn't help with clear or sustain but gives you more power for destroying singular monster camps while giving you more objective control if you use it correctly thanks to it's reduced cooldown.Extending it's bonus duration will also give it the unique ability out of any smite to have all the jungle bonuses at once but as a limiter reducing razorbeak effect allow it to not be too powerful for vision control and only slightly better then sweeping.Please note these effects only apply to enemy jungle camps and if you're able to clear an enemy's entire jungle then you deserve to reap all the rewards.

Thanks for reading !