Every season I've noticed this, at the very end all the bad players who somehow got placed silver start playing and inting every game. Pretty much every game I do good (except that last Xayah game because I had 1500 ms for most of the game and the Ekko game because I was just tilted) and can never win. However fed I get, they have 2 or 3 people on their team just as fed as me. Then my team flames me for not carrying hard enough. Of course I know in the majority of players I'm bad, but I don't see how I'm supposed to get better in these conditions. Pretty sure whatever rank you have at the beginning of October is the highest your gonna get (My winrate went from 57% to 52% during October, and from Silver II to Silver IV).
I know their isn't anything Riot can do about these, you can't ban or punish all the bad players coming in at the end and screwing everything up.