19 yo sprinter with no improvements over the past 2 years

Im 19 yo 400m runner. I ran my pb at 16 which is 51.53. My problem is i can't seem to get anywhere near that anymore? I had a bad injury which kept me out for a while but that was sorted and i got back fit and fast. In that time i ran a 100m + 200m pb. Any ideas?

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