An idea for a TP change
Right now I feel the big problem is TP simply does too much. It helps you back early on if you have issues, provides you with massive map pressure, etc.
What if we reverted the reduced cooldown on towers, and added another summoner spell as compensation?
A summoner spell that would make towers act like the fountain for 5/7 seconds or so. Regen and item purchasing (without the op laser ofc). Such a spell would have the same effect of relieving pressure early on, but unlike TP death is still going to be punishing for the enemy laner. It could have very interesting uses throughout the game, be it allowing for an easy tear pickup early on, to allowing a team to have regen in tower range to help defend. Junglers could pick up the item instead of flash when possible even, since they could run up to their laners and give them an advantage in lane by using it on their tower.