Choose a tiny niche. Solve their problem. "Family Doctor's Office, Local Cafe, Small barber, etc." This is already too broad. Choose one. Suppose you've chose

Choose a tiny niche. Solve their problem. "Family Doctor's Office, Local Cafe, Small barber, etc." This is already too broad. Choose one. Suppose you've chosen "small barber." Now narrow down further to "small barber seattle." Now narrow down further to "small barber, Seattle, Belltown."... And then... Narrow down further: small barber, Seattle, Belltown, men's beard trimming." Now go physically talk to both of these people. If they don't want your MVP, your MVP or vertical is wrong. Write zero code.