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Here is a good example of niching down. There are many companies offering content writing services but not many that can write high-quality technical content that SaaS companies are willing to pay top dollar for.
Business Opportunity: Copy what worked for a general market and apply it to a narrow niche. Bonus points if that niche has money.
Examples: websites for dentists, unlimited website edit service for real estate agents, lead generation for oil service companies, etc. Don’t worry about being unique or innovative. Focusing on making money to start.