As Binaya mentioned, one good example for Instructor-led live online courses could be edureka.co which mainly focuses on Data Science.
Some ideas that we can brainstorm could be-

1. Build a mobile based apps that automates typical daily routine tasks.
2. Build AI based solution to automate the process. This is where every company is marching right now.

To get started, I just read one interesting idea in Quora that can be easily built.

An app that shows automatic notifications from family phones (location, activity), home devices (alarm, nest, etc.) all in one place.

So without anyone texting each other, everyone automatically knows each others' location and status. Examples:

John just left home
No one is at home, alarm 'on', nest 'away'
Jessica arrived at work
Paul is at Safeway
Mary is running at 5mph on

https://www.quora.com/What-everyday-problems-do-people-wish-an-app-could-solve