I need some advice for climbing

So I'm currently a Plat player , I'm not climbing and my win rate is quite horible at the moment. I think my main problem is getting solo killed in lane and not knowing when to group with my team or when to split push. So i'm asking a high elo player to take a look at my account and tell me what I can do to improve. I rly like this game but it frustrates me that sometimes i just dont know what to do so I end up playng on autopilot.
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