I think that riot should give like chat restrictions until the end of the season or something and permanently suspend players that grief and int etc.
If being permanently banned and getting at least four total chat restrictions and two temporary bans wasn't enough for you to reform, what good would simply reapplying chat restrictions over and over ad nauseum do? Clearly, reforming isn't high on your priority list if you managed to get permanently banned twice.
Besides, Riot has done this before - they used to apply indefinitely-scaling Chat Restrictions, which largely resulted in people using their little allotted chat to be extremely toxic, or they opted to intentionally feed or troll to "prove a point". So not only does your idea fail in regards to your own anecdote, but Riot has seen that it'd fail in practice, too.
...but sometimes i just can't hold that and i want you to understand me correctly instead of just hating.
I neither hate nor understand you. What I do understand, very intimately, is anger. Yes, it is difficult to deal with sometimes, and yes, sometimes it can get to a point where it's just all-consuming, but in every case, you always have control. Not direct control, of course, you can't simply just flick a switch in your head and turn off the anger, but you have control nonetheless.
Diversions and release valves. You can redirect anger, or you can expel it. You can put anger to good use, or you can find a way to dissolve it so that it doesn't cause any damage. But if you don't try either of those and simply let anger get to you, then you are the problem, because you're not making an active effort to control it.
I'm sure that it would be a lot better if toxic player wouldn't be put up to the start of the grind by taking their levels and skins but instead restricting some of the features nontoxic players have from the toxic players.
In other words, the chat restrictions. The baseline punishment tier, that, when it comes to toxic players, typically doesn't work? How many times should Riot chat restrict you before they get tired of you ignoring the rules and being toxic? How long should Riot let you break the rules before they put their foot down?
Because, they have to put their foot down somewhere. They're not going to keep giving you the same punishment over and over and over again while you deliberately flout the rules you agreed to in their faces. You think permabanning toxic players is too rough, well, if you got to the permanent ban, then maybe you need Riot to be rough with you. 'Cause clearly, nothing else is working to get you following the rules.
I've talked to people and experienced a lot about this theme and i think that this is a great good solution to some of the problems Riot games have.
What problem? That toxic players don't like getting permanently banned? Frankly, that's not a problem that needs solving, especially not in a way that simply introduces more problems (like an uptick in trolling/intentional feeding cases).
...because majority of toxic players will create a new acc and may be toxic again.
And your source of that info is...?
If Riot games would do the system where toxic guys would get silenced in chat - they would basically be silenced and not create new acc to flame or so and there would be less or same amount of toxicity...
If your solution doesn't actually improve the situation, if you openly state that there's a chance that toxicity levels would stay the same, then your solution doesn't work.
Beyond that, refer above; players under longer-duration Chat Restrictions back when Riot had indefinitely-scaling CR's largely resolved to intentionally feed or troll to express their toxicity for lack of chat. Is that really something we want?
the toxic players wouldn't get depressed because of the lost account.
Here's a question; why should we feel concerned for how bad a toxic player feels after losing their account, when they show no concern for how other players feel for having to deal with their awful behavior?
If they lost their account, then I hate to say it, but, tough. They agreed to follow a set of simple behavioral rules, and they ignored and broke those rules time and time again, to the point where Riot had to give them the boot. If they feel bad about losing their account because they ran it into the ground, then maybe, just maybe, they'll learn to respect the rules.
But I see little reason to sympathize with players who go out of their way to make other peoples' games awful.