Other game modes do matter
Summoner's Rift is not the end all be all. 5's is fine, every now and then sure, but having one favored game mode to the exclusion of all others GREATLY hinders replayability-- especially six years in like I am. You already let Dominion and the Crystal Scar die a horrible death. Don't let 3's/TT and ARAM/HA fall to the same fate.
-Address the bot problem in both -Open up the champ pool in ARAM so ARAM account fucks can play bad champs like the rest of us -Do mode-specific rebalances to keep URF Sona level winrates from popping up, which they do, every fucking day
Fuck SR. Fuck 5's. That's all.