If you want to reduce snowballing, then baron needs to be nerfed.
And i dont mean baron itself, i mean the buff it gives.
On a close game whoever gets the baron just kinds of run down the other team base and wins the game, and with how easy is to tank and do baron it means the game becomes super snowbally since 20 mins in theres already a chance a team thats sightly ahead do baron and then just win the game on spot.
The minion buff it gives needs to be seriously nerfed or the AD/AP it gives needs to be straight up removed.
To add, rift herald also needs a nerf on its damage to tower, right now its pretty much a free tower for absolutely free even without minions and if you're splitting and theres nobody on the side of the map, you can get 2~3 towers with it easily since it just 1 shots towers.