Hmmm yeah that makes sense to start where you are most comfortable. I used to be a big chords/structure guy but have since moved to really focusing on lyrics and melody. One thing I suggest that has helped me is not forcing it too much but looking for odd times in the day to try things out. Like today driving to the gym I finally figured out a good lyric option for a song I'm working on. Another thing is that you could try working on the melody/lyrics without playing an instrument. Sometimes it becomes a crutch or it kinda limits your creativity if you're really used to that security.