Whether you're an amateur or professional writer there is always scope for improvement. A few years back I started a course in Journalism but had to stop doing it whilst I was writing books about WW1. Now I'm coming towards the end of that process I decided it was time to resume my studies - I only have 4 assignments to complete and it would be a shame if I didn't finish it - that's just not in my nature!
Would I still get published if I didn't finish the course - yes. I know this because I was already getting published before I started the course. You might be thinking if I was getting published why did I need to take a course? It was because I wanted new ideas as to how I could improve my pitches and hit rate. Things change in journalism all the time and it's good to keep yourself up to date with what is current and stay ahead of the game.
So, if you're doing okay with your articles and features but think they're lacking that special something and you want to do better, consider investing some of your time and energy on a course that could see you get to the level in your writing career that you want to.