Question About MMR

Ok ,so my MMR is For B3 and i struggle to get to S4 from S5... ok ? Notice that last season i finish Gold5 , why i play in much lower division is because of my laptop... but that`s not important . So , i play the last games adc . i have mostly all games this stats 200+creeps. 10+Kills.(sometimes lower but i dont die more times than i kill. 6,7 deaths per game . i buy trinkets. i do drakes alone because the jungler dont care about that . i beg my team to group and they call me noob and ask me why should they listen to me .. Please someone , Illuminate me .. what i do wrong ? i m not being cooky .. i just dont understand ...
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