https://www.joelonsoftware.com/2007/12/06/where-theres-muck-...
There are plenty of unsolved problems.
An alternative is to look for a problem that has been "solved", but not in a certain niche. For example, inventory control and tracking production seems to be a "solved" problem, but it turned out it wasn't a "solved" problem for small/medium-scale electronics manufacturing, which is the niche I'm in.
Why do you think you need to find a truly unsolved problem? If all you want is a profitable, sustainable business, look at what companies are already paying for, and build a product that solves one of those problems. It doesn't have to be a carbon copy of an existing product. You can differentiate by price or combination of features. Or you can target a different niche. Competition is a signal that there's money to be made in the market.
It won't be easy, and you will have to learn sales & marketing. But it is doable. If there are X companies in the market, there's likely a place for another one (as long as this isn't a winner-takes-all type of market).
I just found out yesterday that AWS Amplify doesn't have a manual deploy button. It's only job is to build and deploy an app and there is nowhere on Amplify itself where you can press a button and kick off a build! Junk like this is everywhere now. It's a golden opportunity for people who know what they're doing.
