Placement matches

How do they work? I thought it was calculating based on wins although I won 7 out of the 10 games and I got Bronze III. The last seasons winning 5-6 got me in Silver III-IV and I stayed somewhere in Silver at the end of each season. I'm obviously not the best player, kind of mediocre but that's a long ladder to climb and I guess winning games is more important than grabbing every kill for me. So what's the new qouta for placement now?{{sticker:zombie-nunu-bummed}}
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