Anything that helps people accelerate/optimize something they’re already doing will sell. If you can observe where money is flowing and make it flow faster, you will always be able to take a percentage for yourself.
No market is saturated, not even commodities. You just need to offer something that accelerates the flow.
It’s flowing everywhere.
Look at your bank statement, what are you spending money on? Look at SEC filings, what are companies spending money on? Look at advertisements, consumer reports, web traffic, social media engagement metrics, government budgets, business foot traffic metrics on google maps. What are people interested in?
Look at the clothes people wear, the Christmas decorations your neighbors have up, the app your coworker is using, the music playing in the grocery store. The food you ate this morning, the candle your wife brought home, the phone case you’re holding, the styling cream you have in your hair.
All of these things are opportunities for a business