To an A-student overachiever in the top 5% of their class they must look positively tantalizing. Even assuming half of that 3.5% have insurmountable brand habit

To an A-student overachiever in the top 5% of their class they must look positively tantalizing. Even assuming half of that 3.5% have insurmountable brand habit or other scale moats not available to you. Assuming you have many ideas/solutions, how would you choose an under served market category to target? If there is no low hanging fruit left users must be very happy. Or too set in their ways or addicted. The app stores are not going to advertize their true user content metrics like countries do but rest assured app stores have that data and would move to a much more exploitative mode if they believed no new great apps are to come.