I honestly think Riot is doing a pretty good job.
3 days ago now I got two week suspension for "Intentionally feeding a few bag games really wasn't intentional but my last game looked the worst of all because a (Toxic Player went top lane & stole my role leaving the game unplayable.) (Well tried to play it off meta jungle and died 14 times rather than go afk only a 1% Chance for it to work anyways.)
1.) Riot has seemed to address toxicity in Chat, lots of users get banned and its deserved most of the time (Riot actually helped me improve some of my behavior in chat wasting time arguing with (IDIOTS) who never learn now I just (/mute all) play the fucking game and not care)
2.) What needs to be addressed now and its a major issue because I have seen it happen more than myself is (Role Stealing) Riot has done a great job adding role selection to the game, it really has helped decrease toxicity a lot compared to what it was last year over roles, but now some players see someone go LuLu, or Sona mid (They immediately say (NO GO SUPPORT) I say (NO I don't play Dual Lane for a reason of FEEDING) and they proceed to go in game and be toxic taking the role (What happened to me last game before getting 2 weeks ban same thing happens like 99% of the time when im not duo bot with people who know what to do perhaps its a bit better but usually gets feed.
Anyways that said there needs to be a (Strict Stance) About taking roles when everyone can now choose their two roles they want to play and get either ( Everyone knows over the years I usually do better in Solo roles, there are 3 roles I can do, and it (DOESNT MATTER) what ( I CHOOSE ) (To take Where) (IF) I am an (intentional Feeder / TROLL) then let me troll and get banned for trolling constantly, this doesn't give other users the right to come in lane and be toxcic making me get banned for doing bad because they took the role and rendered the game useless for 3 other players who possibly wanted to win the game or even try.
So in other words me doing bad because of being trolled, shouldn't be punishable, but me playing off meta top wasn't a ban worthy offense, and the player should not have done what they did trolling just because they didn't agree with it, honestly if my team had stuck with the original layout of champions they told me they were going it would have been better and made more sense.
3.) The third thing (Going Janna Jungle) Isn't ban worthy (Riot Said Its not) Obviously its not going to work well but Riot Said they don't enforce a meta, if that player (Intentionally Feeds) as the jungler then yes, but obviously this can't be fixed.)
IMO, its useless just like there are many other jungles who IMO are useless, but it depends first what your (Team Comp IS) Going (Master YI) isn't always good when you need specific types of (All in play) for example, and the enemy has taken (TEEMO), although there is a counter many don't use vs a teemo get 
on Master YI use it and just eat him alive.
4.) The Automatic Feeder ban does need re-working been banned twice for it with many factors not taken into place the first time I understand last year, but this time its obviously way off so false positives is already a thing, the thing Riot needs to do is address the causes of feeding, and better match-making with players who play similiar alike one another to prevent toxicity aka the useless Jungler, which junglers have a huge impact on a game early game and can actually carry the game by getting their allies ahead or behind.
. In other words automatic bans for feeding actually works but it doesn't take into account that the person was in my lane making me unable to do a lane phase so I had to try to counter jungle the enemy on a off meta support so I feed.
. Doesn't take into account when a player is constantly ganked by another player in their lane and your teams jungle does nothing (Sure play better I understand play more (D), and when in the LCS, or Higher ELO/ PRO its easier but in lower ELO its harder when you got players who have no idea what they are doing sometimes you just end up feeding hard (My Azir Game for example) because Riot thinks it was intentional feed for sure I just got really fucked over mid thinking his kit had changed but it was really garbage IMO and I flat out sucked, but doesn't mean I intentionally fed the Nidalee.
What Riot should do TO-DO list?
1.) add the ability for users in the lobby to change roles with one another to make it official with a confirmation box on each players screen.
2.) What and why Riot can't enforce meta of champions, lets say you don't want Janna Jungle anymore that can be done by fixing it so players playing (X) role can't select Janna as a mid lane only as a support, and that solves the Solo Queue toxicity.
3.) Possibly add a system like DOTA 2 has where if a player abandons 5 minutes players can leave?
4.) Add system to disband within 2-3 minutes of game starting if players don't connect or are toxic vote disband, Could solve some problems.
The problem is that pre-mades, and or players can still choose roles, and switch with other players so in reality it solves nothing.
