Add more power to Smite other than Chilling Smite
As a jungle main, I've noticed that I and many other junglers tend to pick up chilling smite way more often than the other jungle items.
Chilling is just inherently better than the other two items . Challenging Smite is really not viable except for some niche AD picks like Yi, Shyvana,, Xin, Nocturne, and Warwick, but even then, you'll still want Chilling since most of those I mentioned lack any strong CC.
Unless your team is really built around the jungler and can provide the CC necessary when they gank, Challenging Smite is just gonna fall short. Challenging should provide movement speed or something.
Trackers might also need a considerate buff. I only ever see it on counter junglers like Lee Sin, Shaco, Nunu, and Evelynn, and that is even rare in of itself. Maybe it should even get a minor smite effect to make it better like adding a circular vision radius around the last thing you smite for 1.5 minutes.