I think what I would say to my younger self, and probably to younger, just starting-out writers is that a lot of times you're just afraid to put yourself out there, and it's uncomfortable because it's working up the courage to do something, to push yourself to do those things.
All the times I've been lucky enough to be a part of a show that's actually gotten on the air, it's always that same mixture of excitement and utter fear.
It's that one thing that you're passionate about, that you end up developing tunnel vision for and everything else tends to fall by the wayside. Passion is appealing and universal.