Ser refers specifically to permanent characterisistics of an object.
Estar refers specifically to characteristics of an object that change.
“Yo so humano” is something that can never change, so “yo estoy humano” only makes sense if you are a shape shifter and you were a cat or something a moment ago. Outside of poetry or sci fi, this is never going to work.
Likewise, “Yo estoy en Los Angeles” is something temporary because you are at that place at that moment. But a person from there can say something like “Yo soy de Los Angeles” and that’s an unchanging thing–it’ll always be their origin city even if they live in Paris.
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