Talking to customers is only useful when you've learned what to listen for.
To find product/market fit, ask about what they do and listen for their goals, actions and obstacles. You'll learn where they need help.
To create a business model that fits the customers' life, learn about the events in their life that made them take interest in changing, when they discovered new options, and what triggered them to buy.
What are they trying to achieve? Why? -ly words are clues here. Cheaply? Quickly? Conveniently? Big difference.
Where are they already taking action for themselves? What they're doing now tells you how much it's worth to them, and reveals their lessons learned.
Any problems or friction they encounter? These can be serious impediments, or just inconveniences.