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I only know of one.

By breeding it to an unrelated or distantly related line. Introduce new blood.

As stated, the above birds are very young. There are some SOP lines out there that haven’t been out-crossed in a long time and have issues with vigor, so laying/hatching could be way down. A good SOP breed BPR can’t quite keep up with a Leghorn or Australorp but can hold their own in the nest...