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If you're looking for a startup, something that's supposed to start cheap and scale huge in <10 years, then you're probably only looking at problems that can be addressed by software on the internet.

That being said, you don't have to look there. You can start a huge variety of businesses just by gaining modest expertise in something new and then charging people for doing that thing. EX: get a $1K drone, learn to fly it, and charge half of what it would cost a helicopter/plane to get the same shot. It's not a startup, but it's a business, and it might lead to a startup.

Startups seem to be bimodal (no I don't have data for this) in that they're either business-focused or solution-focused. Uber is business-focused. They don't give a damn about anything other than fat stacks of cash. Tesla is solution-focused. Musk just needs the business to last long enough to achieve his goal of shifting the market away from fossil fuels.

It's a lot easier to find a business opportunity than to find a solution you're passionate about AND makes for a good business. Most people who just pursue a solution end up in non-profits or simply realize that there's no way to sustain an organization providing that solution.

If you're just looking for a chewy problem to solve, then PM me because I'm working on a good one.