4queue Toxicity/Normal Mode Idea

I hope this is where this is supposed to go.

I don't want to make this an extremely long post so basically my thought is that 4queue's consistently pick on the single person that happens to not be a part of their 4queue in a normal. If anything goes wrong, time and again its the single queues fault. Not the other 4 who are probably not communicating at all with the 5th, won't criticize each others performance. Oh no. Always the single queue.

We need 4queue's to simply not be allowed, or maybe another idea is to have a Practice mode, that is literally restricted like Ranked, only one duo (preferably no duo frankly) per team, everyone else is solo. How else can someone properly practice for ranked mode without Actually playing ranked mode and potentially losing Elo because they wanted to practice a role without the influence of queueing with friends and the toxic attacks generated by other 3-4 queues?

I don't have any other ideas, but I feel like either solution (or hey, both of them!) could go a long way to helping this game.