im stuck in low MMR someone help

So my MMR is stuck prety low and that means ill get a players from my MMR and that means my team will be low MMR too and im kind of losing bcs my teams are not whare they shuld be and trying to do usles risks on objectivs and when i tell them to not fight and to hold on so i can take side lane turet sometimes they jsut go in. What i mean is that when i go to a game my team is the same MMR as me and sometimes i lose becouse of them and i cant solo cerry that good i mean league of legends is 5v5 game and when i lose my MMR is going lower too. Any tips i can escape this loop?
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