About jungle that nobody talks about
In terms of jungle, people always complain that jungle camps don't give enough, and it's just more worth it to spam ganks and abuse the catch up exp system to stay the same as the enemy jungler while also getting laners ahead. What I haven't heard people complain about for some reason is the indirect killing of counter jungling and many playstyles that revolved around this.
I used to play jungle and my favourite champions in the game were Yi, Kha Zix, and Wukong, which I used to play with a very passive farm for late carry playstyle while counter jungling in more of a stealthy way, avoiding contact and being seen. When Poacher's dirk was added to the game (I know a lot of people ignored it, but it was a genuinely a very good item), I used to play kayn with his insanely good counter jungling (fast clears + easy escape/entrance), and I would get my poachers dirk evolved very fast, and it made jungling fun again, and not just a game of who can gank the best teammate.
With how the jungle is right now, and with all these new changes making junglers even more impactful on the game (despite them already being by far the most impactful), I think being counter jungled needs to have an actual affect on your level/items. Whether this be done by giving more items like Poachers dirk, something that give +exp/gold on the enemy jungle, or even indirect nerfs to jungle like making experience 1/4 for both while someone with a jungle item is present in lane, losing 50% experience for the laner and jungler.
Another thing is how easy Rift herald and the current dragons are to kill. Rift herald can be done by someone by themselves at around level 8, and for how impactful gold from turrets and their platings are, it needs to be buffed so a ganking jungle like jarvan or twitch can't solo it as well as a farm jungler like Udyr or Yi.
The dragons need a big buff with much more aoe, especially now with how impactful the dragons will be. It should get the baron treatment + some more damage/health, so a jungler like shyvana and udyr who are strong junglers because they can solo it, will be able to, while a jungler like Rammus and Kindred will have a much harder time, and just spam ganking bot lane and getting their help won't mean you can get free dragons.
A cool way to make the dragons harder to kill would be something like Vilemaw and how it pulls you into it, or maybe make the dragon pit a rammus ult with tremors, or give the dragon a halfway point, where once it gets below half hp it goes into a rage and starts doing cool abilities like moving around the pit and shooting flames around that stick to you and deal dot damage. It doesn't really matter what is done, I just wanted to make my point by giving some examples.
Tl;dr Give more for counter jungling, make losing jungle to the enemy more impactful, fix large objectives that have a massive outcome on the game.