What are the key mistakes in Golds (like me) who can't reach Platinum or higher?

Can't seem to get higher than what I'm currently in. What could be the case? I can't seem to win games by myself when it's about Gold. I could've done that in Bronze and Silver but I'm struggling to do so in Gold. I'm not sure where my play becomes weak. It's not quite clear to me when or how did I blunder the game.
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