An idea for towers: Enrage Mode
Every attack on a champion gives a turret one stack of <insert name here>. The more stacks, the more damage. That's similiar how it is right now with consecutive shots.
However, at some point (4th or 5th shot) the turret goes into full rage-mode, and fires a super-shot, with increased projectile speed and true damage that slows in an AoE after the impact. The turrets keeps shooting these super-shots at champions for the next 30 seconds before losing all stacks and resetting. Ofc this would require some visual inidcators on the turret-crystals to show on what rage-level the tower is right now, but that shouldn't be much of a problem.
Now that would still enable dives, but not to the point where people can just juggle 4-5 shots without any consequences.