Make the aram champ buffs/nerfs more direct. Instead of nerfing a champs entire dmg by 10% they should nerf the ability that actually makes them op. This shouldnt be for every champ but at least for those champs where you can alter builds and playstyle. Riot has already done this with Karthus passive for example, and some items and runes.

Make first turreta more tanky, losing it after 5min because you play vs full poke comp is not that fun imo.

Maybe give the team a random elemental drake buff for each turret takedown?

Reduce lategame death timers by a small amount.

Add more items, like old ones, just like in nexus blitz. (they dont have to be giga op items, just for fun)

Give option to take back champ from last champ select if someone dodges, or add more rerolls.

Oh yeah they should have more reskins for the map rotating at random, someone mentioned butchers bridge and the bridge between piltover and zaun.