My advice: Spend almost as much time asking people if you can write for them as you do actually writing for them. In the early days, I spent upwards of half of my time asking editors if I can write for them. Most ignored me. Several rejected me. But a handful said yes. In other words, being a freelance writer requires a lot of hustle. That lessens the longer you’re in the game and the more “free” referral work you get as you build your reputation. But even now after years of bylines I have to hustle to ask people if I can write for them. Good luck!