How do you even win games in ranked?

Like really, why winning ranked games is so damn hard? I mainly played normal games, but finally the temptation took over me and I've done my placements...and won 4 out of 10 the system put me in Silver V...and after that, I haven't won a single god damn game... So what is the problem? If i don't belong to this mmr, why did the system put me in this league from the beginning? Can anybody help me pls? Because i'm getting really most of silver elo games, people are toxic af and perform poorly and even if I get lucky and get good teammates in one game, then i, myself seem to perform bad and lose the game Tl; Dr: can anybody tell me how to win games in Silver V?
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