Cannot get past bronze 1

This is daft i know i think i have a problem, so i win 20 games in a row from bronze 5 I have done this time and time again but the second i get in bronze one i feel that it starts putting me against plat player because i have being in bronze 1 5 times and never won a game. I am starting to think i am cursed what the hell is happening is my elo being boosted like crazy in bronze one or what its not even that my teams are bad, I get really good teams what the hell is happening pls tell.
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