Ask HN: What to do when you don't have enough problems to solve?

Sometimes I come home from work at the end of the day and I still have the hankering for a problem that needs solving with code.

The issue is, if it's something that someone else has already done a strictly better job of implementing, it tends to feel empty. Now, obviously it's uncommon for an individual without a PhD or a senior FAANG position to do something that's both generally-useful and truly an improvement on what's out there already. So most of us instead occupy ourselves with solving narrower problems specific to a given organization.

But that still leaves the question: what problems can I truly solve - even small, narrow ones - in my spare time? Outside the context of a job or even a business idea.