“choose a collection of things a collections of ideas that you can and want to live up to when you're presenting yourself online and consistently show up as that person you'll find that authenticity here is a consequence and not just a prerequisite”

Earn authenticity through consistency, not declaration

You don't start authentic and then post — you post consistently and authenticity gets retroactively assigned to you. Define the 3-5 ideas you'll show up for, then ship against them daily for a year before judging whether it's working. The label "authentic" is the byproduct of repetition, not the input you need before pressing publish.