IMO: Dont. Some of the best devs and biggest projects do not use GitHub. Some very impressive projects do not open there code. Some very good devs do not do open source.
Lean on your unique experience, the value you can bring to the organization, and the combination of skill sets you posses. Demo completed and working projects, show off some writing, share presentations or contributions to your community of choice.
If a organization will not hire you because you do not have an impressive GH profile, run away- fast.
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