I’ve written about this many times, but Seth Godin writes about it in a way that applies to anyone, and most definitely photographers.
Most people with a big idea, great talent and/or something to say don’t get lucky at first. Or second. Or even third. It’s so easy to conclude that if you’re not lucky, you’re not good. So persistence becomes an essential element of good, because without persistence, you never get a chance to get lucky.