Tips to consistently climb with bad teammates?

Hi, I started playing league around mid -> late season 8 and now I'm sitting at gold 4 and can't climb out of it. The problem I found is whenever I got super ahead, my team just get super cocky then /all chat trash talk, bm then ended up throwing the game. Some of my plat, diamond friend just told me to get better then mute all for tilt proof, but if I mute all then it just going to get worse since gold player acts ridiculously childish when they lose lane, often following up with the run down other's lane then tilting others. I wonder if there is an actual way to win consistently cuz the match making is coinflip, I either get bad players or good players, so my games are always 50:50. I'm appreciate the tips and advice ty <3 .
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