Get in the groove
Have you ever gotten suddenly very motivated to workout after not having done it in a while? You go to the gym, put yourself thru a long and grueling workout, and feel very rewarded for the effort you put in.
How do you feel the next day? Often times, very much not good. You hurt all over. So you take a break for the day. Sometimes, you hurt the next day too and take another rest day. Next thing you know, you look up and you haven't exercised again for a whole week. Not training is bad, but overtraining infrequently is not much better. Next time, you instead go the gym and get yourself a reasonable dose of sweat. The next day, you're ready to go again. And the next day and the next day and the next day.
Your development can, and should be, similar. It's not meant to be easy but if you put in a herculean effort every time you work on growth you will burn yourself out. Start small and build the habit up. For example, if you're working on your writing you can start with a clear and concise 3 sentence summary to your boss about your daily priorities. Work up to the published article you've set your dreams on later.