my 3 recent games went horrible

I went full tilt.. literally how can I even stop this? I mute everyone, but sometimes I just get soo extremely mad I still have to let the anger words out which only makes myself more and more worried for not recieving season rewards. I took small breaks but it didnt even help either. is there any tips to prevent this? And by the way, no "quit league" I still enjoy the game but I have no idea how to stop my anger.. this doesnt come from flamers, but I get soo mad simply of others mistakes in the game (my team)
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