I think that problems will obviously need to resonate with enough people for a startup to even exist.
As a recent graduate, honestly I have not experienced many of the industry pain points, and am limited to the really general food delivery, dating apps, edtech tools.
I did work on certain problems before. A group of us worked on a few versions of an MVP for an in-class active learning backchannel that many students & professors thought they needed. It was a complete disaster that ended with both sides realizing it was not a pain enough problem for them.
I also worked on a dating app that tried to solve a problem in my high school days. It allowed someone to anonymously send 'smooches' to their crushes, who would ideally see the email and sign up to do the same to their own crushes, alerting them of a match if they sent one to a person who sent to them. It was fun but didn't really get a lot of attention and traction.
Right now in a bit of an idea drought and don't know what to work on concretely.