Someone explain why the %%%% is plat 3 so hard to escape

3 years in this %%%%ing elo whatever i do to climb its impossible . i go to promos for plat 2 once every 2 months , i of course lose them because my team either feeds , or goes afk and then the losing streak begins again. what am i supposed to do. in all of my games i mute the chat but nothing changes .. i just cant anymore....
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