Turrets need the most urgent fix
Turrets are the reason snowballing is the easiest thing in League next to playing Warwick. They give a very high amount of gold and they're extremely easy to take. If we fix turrets now I can see so many things actually improving in League. I'll even give some examples of what I think would improve.
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Death timers actually wouldn't be that long if it was harder to get turrets, because they'd maybe get a turret and possibly (a contested) baron, instead of 2 or 3 turrets and (rarely contested) dragon/baron.
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Games would not snowball into oblivion. I'm so tired of people being able to get 1-2 turrets by 10 minutes and that's game. I want to see a turret be taken by 15-17 minutes as a team effort, not 2 turrets be taken by split pushing top and the 4 mid shoving crazy to get the other turret.
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Possibly better changes for items that are complete garbage now and get out shined by Zz'rot because turrets are so weak.

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Games would actually last 30-45 minutes, and wouldn't be a complete stomp the whole time. Everytime a game actually does last 30-45 minutes, it's because a team comp wins, not because of player skill, because there is so many broken champions right now that cause it to last this long after they lose lanes and early.