I came across a piece of advice from New York Times and USA Today Best Selling Author Brenda Novak that I'd like to share. The post itself is a bit dated. It's from June 28, 2016 but is still relevant and I feel will be relevant for years to come.
The advice revolves around believing in yourself and your talent. This not only applies to writers but to anyone who has a dream of accomplishing something. I've printed out the post and put it where I'll see it every day because, like most people, I have my days when I suffer from doubts that I will ever accomplish my goal of being able to write full time.
Here's the link: So You Think You Can Write