I usually combine sharing what I can with showing my credentials (I've a PhD and can share the work I did for that, which I don't put on GitHub because it doesn

I usually combine sharing what I can with showing my credentials (I've a PhD and can share the work I did for that, which I don't put on GitHub because it doesn't feel like the place for it), as well as share anecdotes and get others to vouch for my ability. I've found actual credentials are the best help, but your mileage may vary.