Ask HN: How do you find a worthy startup idea?

During the summer break I've been feeling anxious due to not having a worthy startup or side project to work on. By worthy, I mean something that actually has potential to make money. I've taken online courses and even released an app years ago which made some pocket change but now it feels like I've hit a wall.

I find it harder to come up with ideas as time goes by partly because I can find flaws in them more easily.

I don't want to just wait for the perfect problem but I also don't want to start on building something just because of how anxious I feel by doing nothing.

Has anyone else been through something like this? How did you get out of it?