Help me get out of bronze

Hello, so I had been recently demoted due to feeding of a teammate Thresh from my last game, I need some help to get to Silver or even Bronze I, I play normally jungle and top tanky or assasin. I am stuck in bronze since the beginning of the season and it's that annoying that I am not enjoying the game the way I enjoyed when I started in the past due to the immense frustration from trying very hard to play good and losing because of a teammate or the pessimism of a teammate or even the bad coordination from my team. In advance, thanks for help or advices.
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