Plan after first 10k

I am running my first 10k on Sunday and can't wait for it. I started out with c25k then adopted a 10k plan. So what next?

My predicted time for the 10k is around 55 minutes. Should I start a half marathon plan or try and get a faster 10k time?

I much prefer following a set plan instead of simply going out and running til I am tired.

Does anyone have any links to training plans that would help me?

Thanks.

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