Can you give me some ideas that are more innovative, solve larger problems and have a good chance of reaching significant revenues?
Here are few possible idea to consider:
1. Automated assistant with conversational skills as well. Imagine talking with your virtual personal assistant about almost everything, it will be an important trend in the next couple years! 
 2. A robot that could perform household tasks such as cooking for elderly people who need assistance due to disability. 
3. Augmented reality app that shows what's behind or around objects through cameras attached to glasses, like Pokemon Go but with more information about surroundings