Hey Repholder, (Sorry didn't get your name)
I am a content writer, not good as you are. You have pointed out things I have been facing like unhappy clients, not-meeting deadlines, daunting lists of tasks such as out reach, research, cover creation (featured image ), etc.
I think to get better at content writing we need to practice it daily no matter what we write. It could be about how we spent our day. Through this daily routine we can improve our writing.
There are a lot of people willing to pay hundreds of dollars for an article but they are looking for content writers who are creative, concise and have their voice. If you don't have your own style of writing and fail to impress your clients by providing value (More than promised) you are going to survive in this industry.
Thanks for these tips on how to be a good content writer.