As Naval says, we live in a world where there is no scarcity of information but there is a scarcity of desire to learn.
There are many simple things when done persistently can reap huge returns. The best to do things consistently is to build habits.
A startup that focuses on forcing people to build habits can be a huge help for many people. As an example, I am a person who is super bad at waking up early in the morning. I wish there was someone who calls me in the morning and wakes me up by knowing my exact sleep cycles so that I can have healthy sleeping habits.
A PA or an AI assistant who helps me stay healthy (mentally and physically) and stay smart by following up on the initiatives that I took to gain knowledge.