"you cant" k. Maybe try working on yourself? I don't remember last time I raged. If you play fullQ or in a team and legit rage often I'd make sure to not have you as my teammate.
I don't remember last time I raged. If people don't know, or are too stupid to do something (e.g. take long with 2 mollos and flashes on d2) I will just explain it. If they keep doing it wrong, or we keep getting rekt there, I will just call to play in a different way. Sometimes there is nothing you can do. You can then just try to focus on your own game - still without being selfish -
If people just keep doing stupid things. Can try to tell them. Sometimes I do, sometimes I don't. Not correcting every bad play they do. Otherwise they will just lose confidence. Most of the time people know when they fucked up anyway, unless you are lowlvl / low amt. of hours.