Can I get help with improving?

So I want to play the game with champions I like, but too often I keep on making mistakes that drain my will to continue playong whenever they happen. I want help so that I don't ake those mistakes as much anymore. I play these champions mid {{champion:136}} {{champion:45}} {{champion:112}} I want to get better, and please don't say that my picks are not viable or something like that.
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