Good question. This is what I struggled with the the first one. That is why I did not make any sales. Although people were “interested” in the topic, there was not a HIGHLY DESIRABLE outcome I was providing.
So first, I would pick whichever topic you feel you know the most about. Then think about what one desire do most all of the people in that field desire. What ONE thing could you teach them that would have a huge, noticeable and immediate impact on them? You need to have a PROVABLE, TANGIBLE Result people can see from your offer.
I am also in the process of adding another bonus to help with coming up with great ideas for topic.