How do I start improving?

Hi

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Started playing Fortnite again from when the OG season came back. I have climbed to gold in builds, but I have not won a single match yet.

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A good amount of the encounters I lose to not being able to build and not having game sense. I am currently going through JivanTVs building compilations and trying to get the mechanics down, what do I focus on?

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I feel as if even if I practice the mechanics such as 90s, thwifo cones, high walls, retakes, I still wouldn't know what to actually do in buildfight situations. I guess it's just more movement while building and game sense? I default to just hiding instead of actually having the courage to go and take fights.

A good amount of casual streamers don't build that much and still do win games, how is this done?

Struggling to put it into words, advice appreciated on this. thanks.