Americans, what’s something you would actually pay someone to do or buy?

I’m outside the U.S. and want to build a skill, product, or online business that serves American customers. I’m open to anything: not just freelancing or remote work.

If you could recommend one thing I should learn or sell that Americans are genuinely willing to pay good money for, what would it be?

Also, how would you recommend reaching American customers: social media, cold outreach, marketplaces, communities, ads, or something else?

I’m looking for ideas based on real problems and actual demand, not generic “high-income skills.”