There is no secret. Listen to this guy. It’s fantastic. It doesn’t mean that you shouldn’t learn. It doesn’t mean you should give up. Just know that the whole thing is insane, and that you should worry more about enjoying the ride than getting to the destination.
I think the crucial question is how you define success. This is a talent-based industry. A good writer is nothing without good actors, a good director, good cinematographer, good editor, etc.
Any one of those not being there can bring a script down. So sure, luck it is. But when someone asks “what’s the secret to success” which is clearly an impossible question, I think what they’re really asking is: “What can I do to improve my chances of success?”
To which there are many better answers than cross your fingers and keep trying.