George Santos says getting fired from a job is no big deal -- because it's all down to what you make of the experience ... something he's now telling his Cameo legion.

That's just one questionable piece of advice he's already dished out after joining the personalized video message platform ... less than a week after he was booted from Congress.

The disgraced politician proudly introduces himself as the "Expelled member of Congress from New York City" and "Former congressional "Icon"!